Hook

Hook is an assassin that works for the League of Shadows.

History
Black Spider, Cheshire and Hook attended a meeting with Sensei, who gave them instructions to assassinate Selena Gonzalez, the CEO of Farano Enterprises.

Black Spider and Hook infiltrated Gonzalez's office. Kid Flash, Robin and Aqualad tried to protect her, but the assassins captured the three young heroes after a short fight. Black Spider tied them up.

The heroes broke loose and defeated Hook and Black Spider. Selena Gonzalez escaped and was killed by assassins waiting outside. Hook and Spider were taken to jail, but escaped the next day.

Cheshire brought Hook and Black Spider along on the hit on Serling Roquette. Hook took on Miss Martian, who telekinetically directed his hook back at him, knocking him out.

He was taken to Belle Reve Penitentiary, where he helped with Icicle Sr.'s breakout attempt. He stood guard outside Amanda Waller's office with Abra Kadabra and Professor Ojo.

Abilities and equipment
Weaponized hook - Hook attacks his enemies with a hook attached to his right arm connected by a chain, which can be fired at enemies.

Martial arts - Hook seems to have been trained in martial arts of sort.