When he was younger, La'gaan was an eager student who wanted to know a lot about the surface world.
He eventually adopts his superhero sobriquet, Lagoon Boy, inspired in part by his first name, as well as the movie "Creature from the Black Lagoon".
By 2016, his demeanor was still easy-going during more casual situations. However, he has shown frustration at the lack of action he receives during field missions and has demonstrated times of aggressive impulsiveness when it comes to battle. He often uses Atlantean slang and euphemisms in his speech; he is especially fond of using "Neptune's Beard", and calling people who he does not particularly like as "Chum". Some, like Superboy, consider him a jerk, a feeling that La'gaan returns, mostly out of jealousy in regards to the past relationship Superboy and Miss Martian shared.
By 2020, he has greatly changed and matured, becoming more kind, caring and loving and enjoys playing with Prince Artur. He is also bisexual, showing he is a devoted husband in a happy polyamorous marriage to both his wife and husband while happily awaiting the birth of their child. He is also revealed to regret his past behavior, particularly his treatment towards Superboy, admitting he held a petty grudge against him for years and expresses shame he cannot make amends for his actions or immature behavior. La'gaan also shows genuine remorse for both Kaldur and M'gann's pain over losing Conner and wishes he could somehow help.
Lagoon Boy is a male Atlantean with amphibious adaptations. He has green skin, red eyes and webbed ears, claws and feet. He has dark green fins on his head, the ends of which he has tied on a pony tail. He wears black shorts, and a black pouch around his ankle.
In his "puffer mode" his body is inflated like a puffer fish, with glowing mystic tattoos on his arms.
With the other students, La'gaan came to Aqualad's aid when they were ambushed by purists. Ocean-Master's magic weakened him, but they won the day thanks to Topo's ink spout and Superboy's infrared vision. La'gaan could not participate in the final fight with Ocean-Master in the S'atiroman Cave.
Lagoon Boy was waiting in the Mission Room when former Team members Zatanna and Rocket arrived. He watched in shock as Zatanna congratulated Nightwing on his birthday by kissing him on the mouth. When that was over, Nightwing commenced the briefing; Lagoon Boy would be in Beta Squad to secure a rally held by Noor Harjavti.
As the Bio-Ship made it past the Watchtower, Lagoon Boy and Miss Martian received news that a force field had trapped Metropolis. Lagoon Boy reasoned that the two events occurring at the same time could not be a coincidence.
They discussed their travel; Miss Martian thought they were going too slow to save the captured heroes. She inadvertedly showed concern for Superboy in particular, which Lagoon Boy noticed.
Bio-Ship December 1, post-19:36UST
Gamma Squad discovered the location of the captured heroes, and found it was a spaceship, on the move. Miss Martian informed Red Tornado, who instructed Miss Martian and Lagoon Boy to follow, as it was their only option. However, Miss Martian did note that the vessel had a head start, and they could not keep up if it entered light speed.
Bio-Ship December 1, 21:55UTC
Gamma Squad continued to pursue the alien vessel.
Bio-Ship December 1, 22:48UTC
Lagoon Boy expressed his true feelings to Miss Martian of being accepted into the surface world. Miss Martian assured him that she was the same way on Mars, and revealed to La'gaan her true form. Lagoon Boy was unfazed by her appearance, prompting Miss Martian to take on a female form of Lagoon Boy. As the two were about to share a kiss, the Bio-Ship alerted them of an unidentified object in close proximity.
The Bio-Ship moored underneath Kylstar's Vessel. Miss Martian detected no airlocks, meaning only she could phase through, and Lagoon Boy had to stay behind. He accepted his part, and wished her good luck.
Kylstar's Vessel December 1, 23:58UTC
After the heroes convinced Kylstar to release them, he sent all of those who didn't want to join him back to Earth. Despite being underneath the vessel, Lagoon Boy was not overlooked; he was teleported back together with the Bio-Ship.
The Collector's Ship December 1, 19:01EST
The heroes and villains were all teleported into the Collector of Worlds's ship. The first thing Lagoon Boy heard was Nightwing's command to attack the alien robot, and as he was still at the helm of the Bio-Ship, used the ship's cannon to blast the coludroid into bits.
Metropolis December 1, 19:01EST
Lagoon Boy exited the Bio-Ship, eager to know if that was all there was. It wasn't; dozens more coludroids arrived and surrounded the heroes and villains. Nightwing and Atom eventually persuaded their enemy to restore Metropolis and leave Earth.
Metropolis December 1, 22:03EST
Back on the ground, Lagoon Boy checked on people and noticed he didn't see any of the villains who had been with them. Captain Marvel suspected they were teleported by the Collector to a place where they couldn't get them.
When they arrived in New Orleans, they could not find anything suspicious above ground. They went underwater and reached the base of the Kroloteans. They hid from them, while Robin contacted Mal and informed him that they found the base. They were discovered by the Kroloteans and attacked. Lagoon Boy fought off the Kroloteans, until Blue Beetle took a Krolotean hostage and found the abductees. The abductees, including Secretary General Tseng, were terrified of his appearance, but eventually calmed down when he opened their cage with ease. They made it out of the base before its self-destruct caused it to explode. Back on the surface, their backup, the entire Justice League and Team, arrived.
After the League learned of the location of the last Krolotean stronghold, they set up a plan of attack. Aquaman and Lagoon Boy were Beta Squad. They infiltrated Malina Island from the sea, prying open an underwater door and spying in the docks with a periscope. Manta discovered them, and shot his helmet plasma beams at them, but they evaded them. They leaped out of the water to stop the Manta Troopers that had started to fire on them.
Aquaman quickly sought out his main foe, but Manta shot him in the shoulder. While he recovered, Lagoon Boy took down Krolotean Mechs. Aquaman recovered, but found himself surrounded by Mechs. Delta Squad destroyed them for him.
Lagoon Boy, in his inflated form, stormed at Manta, giving Aquaman the opportunity to attack him from the flank. Manta's helmet was thrown clear, and Aquaman was shocked to see his former friend. Orin and Nightwing tried to reason, but Lagoon Boy and Kaldur'ahm saw only enmity. Kaldur escaped, but did notify them of a bomb that was set to go off. Wonder Woman and Wonder Girl swooped in to carry the two Atlanteans back to the Bio-Ship. They managed to outrun the blast.
M'gann had made crab cakes for her boyfriend, who happily ate them. He was unfamiliar with the snack, but he liked them. Miss Martian fed him one, which he declared "true love" to all present, but mainly Superboy. When Artemis arrived, La'gaan welcomed her, and expressed the pleasure of working with her. Artemis, who was not as close to Lagoon Boy as she was to the others, did not know how to respond.
Nightwing gave all present a briefing on the upcoming launch of a communications satellite that would open up communications between Earth and Mars. Since someone might try to sabotage it, Gamma Squad was dispatched to provide security.
Lagoon Boy did not like his role in the plan: he was relegated to patrolling the water. He was jealous because Superboy was with Miss Martian. He spotted their enemy: Manta Troopers, lead by Kaldur'ahm. Lagoon Boy was ordered to wait for backup, but after Superboy called him a rookie, he ignored his orders and attacked.
Though he took down many Manta Troopers, Kaldur shocked him unconscious. He was captured and taken to the Manta-Flyer.
La'gaan was kept in the brig of the Manta-Sub, and made no effort to hide his disdain for Aqualad and Black Manta. Manta ordered his men to take Lagoon Boy to the Partner. Aqualad sedated him—and secretly tagged him with a tracer—and he was placed in a pod.
For a little under a week, Lagoon Boy was experimented upon. The Reach's scientist exposed him to stress, hoping to learn about the Meta-Gene. As he was an average Atlantean only powered by sorcery, he was treated as a human.
When the Team infiltrated the Reach's laboratory, Batgirl, Bumblebee and Robin allowed themselves to be captured and were stored in the same lab as Lagoon Boy. They freed him, and with the others, they made their way to the loading bay. They made sure the captives boarded the Bio-Ship, and then had to hold off the Reach's enforcer, who Wonder Girl named "Black Beetle". The Team did not fare well against him, and one after the other, they were defeated. Lagoon Boy attempted to attack him from behind in his puffer mode, but he was electrocuted and thrown into a computer array.
Blue Beetle joined the fight, and held off the Black Beetle until the others escaped. The fight destroyed much of the ship, and Blue Beetle was thrown clear. Lagoon Boy swam to retrieve him, then boarded the ship. Once everyone was accounted for, La'gaan looked after his girlfriend.
After Zeta-ing to a Chicago junkyard, La'gaan could wait no longer and asked M'gann what was going on between her and Conner. Before he could get a full reply, they were interrupted by Deathstroke and Tigress. Lagoon Boy called for help, then fought Deathstroke. Deathstroke broke La'gaan's leg, then knocked him out. Miss Martian was captured and taken away, just before Nightwing and Superboy arrived to find La'gaan left alone.
Nightwing and Superboy took La'gaan to a hospital. When he woke he insisted on attempting to rescue M'gann, and was enraged Superboy wasn't out looking for her. Nightwing revealed that Aqualad was a not a traitor and that Tigress was really Artemis. La'gaan was initially furious to have been left in the dark, but calmed down once Superboy said he was sure Nightwing had good reasons for keeping the secret from everyone. They then left La'gaan to rest.
On their way back, Miss Martian broke up with La'gaan. She felt he would only ever be her rebound guy, and he deserved better. He felt they could become more than that in time, but could not persuade her.
The pair returned to the warehouse as Nightwing finished a mission update from Batgirl and the Team. The news that Blue and Green Beetle had been freed from Reach control did little to cheer La'gaan up, and he went to watch TV.
Along with the other members of the Team, Lagoon Boy infiltrated the Light-Reach summit disguised as an agent of the League of Shadows. After Aqualad's betrayal was discovered, Vandal Savage ordered the children to be killed. Lagoon Boy broke cover by knocking out his fellow Shadows, and battled against Ubu while in his pufferfish form. After Black Beetle stabbed Ra's al Ghul through the chest, Ubu disengaged from the battle, and escaped with his master's corpse. Lagoon Boy then assisted Miss Martian, who was reeling from the gigantic fire serpent Klarion transmogrified from Deathstroke's sword. Voluntarily throwing himself into the creature's mouth, Lagoon Boy activated his powers and ripped the serpent's head apart. This broke the spell, and he successfully cushioned Miss Martian from impact with the ground. She thanked him telepathically, and their gazes lingered on each other's faces for a moment before they broke off into different directions. The battle ended with the heroes victorious, with the capture of the Reach ambassador, Black Manta, the Brain, and Monsieur Mallah.
When magnetic field disruptors planted by the Reach threatened the Earth, Lagoon Boy joined 39 other heroes of Earth in a briefing in Metropolis. The heroes would use a computer virus provided by Lex Luthor to safely disable the disruptors. The heroes were paired off with another into twenty squads: one member would run interference against weapons guarding the disruptors, allowing the other to get close enough to plant the virus.
Lagoon Boy was paired off with Aqualad, as Sigma Squad. Aqualad offered to distract the Beetle-tech drones so that Lagoon Boy could plant the countermeasure. Lagoon Boy commented that only now is Kaldur trusting him. Kaldur disagreed, as he had entrusted La'gaan with his position on the Team when he left it. With Lagoon Boy mollified, the Atlanteans implemented their plan. Taking advantage of cover provided by Aqualad, Lagoon Boy forced his way towards the disruptor, easily defusing it.
Within minutes, all twenty squads were successful.
Aqualad summoned everyone to the mission room, where Batman informed the Team that they would now operate side by side with the Justice League from the Watchtower. Not because Mount Justice was destroyed, but because they earned the right to do so. Aqualad informed the assembled that although the Team has accomplished much, a lot still needed to be done. He assigned Lagoon Boy to Gamma Squad to investigate Batgirl's lead about the whereabouts of Vandal Savage.
Lagoon Boy left the Team and returned to Atlantis. For years, he held a grudge against Superboy following his break up with Miss Martian and the couple's reconciliation until he eventually managed to let go of past grievances, but never properly made amends with Superboy. At some point, he entered a polyamorous relationship with Coral and Rodunn. They are all happily in love and later got married.
While Orin and Mera were busy at the annual conference of city states, La'gaan watched Artur outside, playing Aquaboy with him. After La'gaan was saved by Aquaboy, he greeted his pregnant wife Coral as she emerged from the conference, and the two swam off for a brief night on the town with Lori Lemaris.
La'gaan was in the vicinity of the second day of the conference when it came under attack by Ocean-Master. He saw Rodunn was injured, with Coral at his side, and charged over to them. Once assured they would be okay, he joined the attack on Ocean-Master. La'gaan fared better than most at landing hits on the attacker, but Orm easily overpowered his many opponents, until a mysterious stranger arrived and forced his retreat, before vanishing himself.
Kaldur and La'gaan reported to Orin. La'gaan informed the king that there was unrest in most of the city states, largely in protest of the high priority given to the repairs to Poseidonis after Ocean-Master's attack.
Later, La'gaan looked on as a giant pillar of flame appeared outside the city creating deadly red waters. He was frustrated when Orin ordered the dome kept sealed. He saw his best friend Blubber outside and was desperate to try to rescue him, having to be held back by Wyynde and Delphis lest he open the gate and let the red water into the city. Blubber was saved by Orin, and the pillar was extinguished by Mera, Ocean-Master and the stranger. La'gaan and the others rushed out once the waters were safe, witnessing the stranger save Mera and Kaldur from Ocean-Master. Once the stranger disarmed Orm, he was easily defeated by Orin, who had Wyynde and La'gaan place him under arrest.
La'gaan prepared to leave on a covert mission to Xebel. Coral and Rodunn were not happy he was leaving when the baby was so close to due, but La'gaan insisted it was an honor to be chosen to join Kaldur, and that he would be home soon.
Kaldur, Wyynde and La'gaan used the ongoing unrest in Xebel to cover their entrance to the city. They made their way to the Grave of Legends, a holy site that marked the thinnest point between Xebel and the Undersea. Kaldur created a drill, while La'gaan lifted rocks and Wyynde directed debris away. Though they hoped Nereus's Watch would be too busy with the crowds to find them, a patrol did come close, but was distracted by a strange light caused by Delphis, who had followed them.
The quartet finished drilling through the sea floor, and swam into the undersea. The tunnel behind them collapsed, causing a cave-in that forced them to rush forward and drill through another floor.
After a month in the Undersea, the group had not found the crown, but had become adept at finding and dousing the geothermal vents that periodically erupted there. When La'gaan expressed concern at possibly missing the birth of his child, Kaldur reminded him that he needed to be 100% focused on the mission at hand. Wyynde tried to comfort La'gaan after Kaldur's harsh words, but La'gaan was not offended and wished he were as strong as Kaldur. Wyynde expressed concerns about Kaldur taking on too much, and not dealing with Conner's death, prompting La'gaan to admits his regrets about never getting to make amends for his grudge against Conner. Then, what they initially thought was another geothermal vent turned out to be a giant crab emerging from the sea floor. The group fled, but the crab sucked the group toward its mouth, until La'gaan allowed himself and a pillar of rock to be swallowed. The pillar was distasteful, so the crab spat La'gaan out and moved on.
The crab had emerged from a chasm, which the group then swam down. They found ruins from the ancient Atlantean capital, and the three magically trained members could all sense great magic power nearby. They fanned out to triangulate its location, and quickly found Arion's crown shallowly buried in the ground. Another giant creature then appeared. Kaldur took hold of the creature and rode it. He then shocked the creature to make it move, as the others grabbed ahold. They rode the creature as it swam upwards, jumping off just before the creature crashed into the ceiling of the Undersea, creating an opening for them to escape through.
They returned to Xebel to find Arion taking the mantle of High King. Before anything else could be said, Arion took the crown and donned it, but was immediately killed by the Lords of Order. Mera then went to crown Orin once more, but Orin insisted that it was Mera who satisfied the prophecy and was the rightful High King.
Later, La'gaan and Wyynde swam to the palace. La'gaan was glad Wyynde's doubts about Kaldur seemed unfounded, but Wyynde worried that would only lead Kaldur to take on even more. They reached the palace as Orin told Kaldur he wanted to return to the Justice League, Kaldur offered to relinquish the title of Aquaman, but Orin was confident the League could accommodate multiple Aquamen-including La'gaan, who was shocked and thrilled at the idea.
Later, he went to see his family and held his newborn child.
Inflation: La'gaan can use Atlantean magic to enlarge his body, dramatically increasing his strength and durability. This is a particular technique that he had chosen to study at the Conservatory.Because of the way his lips are pulled tight, La'gaan is unable to talk while inflated.
Hydrokinesis: Through Atlantean sorcery, he has demonstrated a capacity to form hard water constructs, such as a serpent.
La'gaan and Kaldur are former classmates with both having attended and trained at the Conservatory of Sorcery until Kaldur left to take up the mantle of Aqualad and became Aquaman's protégé. La'gaan strongly admired and idolized him. When Aqualad apparently betrayed the Team and joined to side with his father, Black Manta, Lagoon Boy was enraged by this act, deeming him a traitor for turning against their king and furthermore when he "murdered" Artemis. After discovering the truth of the deep cover mission, La'gaan was furious by the deception and how he almost hurt Kaldur.
Despite learning the truth, La'gaan remained angry and hurt by the secrecy, believing Kaldur did not trust him until they mended fences when Kaldur assured his trust in La'gaan to take his place on the Team following his departure. By 2020, La'gaan and Kaldur's friendship is fully restored and they now share the mantle of Aquaman alongside their returning former mentor.
Miss Martian is Lagoon Boy's ex-girlfriend. Not long after Superboy broke up with her, Miss Martian quickly struck up a romance with Lagoon Boy. They had an open relationship, kissing in public, overly affectionate and Lagoon Boy referred to Miss Martian as his "Angelfish". However, the relationship between them was not based on real love, but out of comfort and selfishness. La'gaan found acceptance from M'gann over his "impure" appearance while M'gann realized La'gaan made her feel better about herself after she began abusing her powers and damaged her relationship with Conner, though she refused to admit it at first. Eventually, M'gann finally ended the relationship after she came to realize the error of her ways, confessing La'gaan was nothing more than her rebound guy and felt he deserved better, much to his disappointment.
Lagoon Boy and Superboy strongly disliked each other and had a rivalry over Miss Martian. Both were jealous of the other's relationship with M'gann. Conner was angry and upset whenever he saw M'gann and La'gaan together, especially when La'gaan actively enjoyed flaunting their new romance in Conner's presence while La'gaan was quick to jealousy whenever the former couple were alone together. Because of their rivalry it often times caused tension and problems for the Team during missions. Although Conner was unhappy with their relationship, he did not interfere, acknowledging that though he considered La'gaan a jerk, he does treat M'gann right, but Conner also knew that La'gaan was nothing more than the rebound guy.
When Miss Martian broke things off with Lagoon Boy, he realized one of the reasons behind their break up was because of Superboy, causing him to hold a grudge against Superboy for years, but overtime managed to let it go. Following Conner's apparent death, La'gaan expresses his deepest regret and remorse over how unfairly he had treated Conner in the past and admits he is shameful he never got the chance to make amends over his petty grudge against him.
When designing his puffer mode, Phil Bourassa's biggest visual inspiration was Kool-Aid Man. The way his lips are pulled back on Bourassa's design lead to Lagoon Boy being unable to speak while in puffer mode.
An Atlantean character in the Teen Titans animated series named Tramm has similar traits to Lagoon Boy, including the ability to inflate his body to enhance his strength.
Lagoon Boy was originally introduced as a minor supporting character in the Aquaman comics in the late '90s. He did not, however, pick up in popularity until his appearances in the Young Justice comic series, during which he appeared in the "Sins of Youth" crossover and even acted as a stand-in member of the team. He made his last notable appearance during the Titans East Special #1, where he, along with the rest of his team, was injured by the demon Trigon. Prior to the events of Flashpoint, he was still in a coma. He made his debut in the New 52 as a part of the 2018 DC limited series, Heroes in Crisis, which he died in his first, and subsequently, only appearance thus far.