Board Thread:Young Justice News/@comment-3974095-20170209201908/@comment-7728766-20180514175203

Ratrangerm wrote: Katanna, Geo Force and Metamorpho are obvious. As Tupka said, most sites are convinced Lightning is the fourth.

One site speculated the fifth is Ambush Bug, though that character didn't have multiple arms. My guess is that the multi-armed being is an alien of some kind, perhaps a character created for the series. I doubt Lightning is the fourth. I think its either Solstice or Halo, but likely the former since the girl has darker skin.

And I think the Four-Arms lookalike is likely Forager.