Future Raven is probably the worst out of all of them, because if there’s anyone who can’t function alone more than Beast Boy, it’s her, though she’ll never admit it, and not having anyone to support means her mind basically completely breaks which wow. It’s probably a combination of both the fact that her powers requiring a lot of mental strength to maintain control means that losing any amount of control destroys her mind, and her general situation, which is so horrible that her friends were the only thing that really made it worth it for her.
Of course, in continuity with season 4, you have to wonder how the apocalypse was averted without the team being together, other than the writers hadn’t thought of it yet. I remember there was a theory back in the day that Raven being mentally ill might also make her unusable as the portal. It’s also possible that an almost-apocolypse happened like in season 4, but it was averted some other way, but completely broke Raven in the process.
wow this entire episode is basically really depressing fic fodder.