The Bizarro Robin was rejected by his team, forcing him to flee to Earth and try to join the regular Titans, who had just fired their own Robin; I'd write in Bizarro-speak, but it am not hard to not do it. #TitansApart

After helping to found the Teen Titans (at least in one telling), Wally West and his colleagues fired Robin, then had a competition with them to see who got to keep Titans Tower; he won, fair and square.

Robin then knee-capped him and threw him out the window. #TitansTogether

A very respectable and competent hero, non-super-powered archer Roy Harper competed with Robin on a number of levels, including for the affections of Starfire; he was a key player in two different, incompatible 'Teen Titans Go!' origin stories. #TitansTogether

When Terra (probably a Tara Markov) showed up in Titans Tower, she exhibited highly suspicious behavior, implying that she was a spy; the 'Teen Titans Go!' team missed all these hints, though, blaming the whole thing on Raven being jealous of Terra's relationship with Beast Boy. #TitansTogether

This Robin (who is probably a Dick Grayson) hand-picked his own, perfectly balanced team of heroes to perfectly complement each other; they promptly threw him off the team, forcing him to work with Beast Boy, Cyborg, Raven and Starfire, who drove him nuts and mocked his baby hands. #TitansTogether

After the 'Endless Winter' crisis activated her metagene, Summer Zahid developed the power to generate ice and cold; she initially had no control over this ability, enrolled in the Titans Academy to learn her cryokinetic stuff.

Her activities since the school closed are unrevealed. #TitansTogether

Possessing electrokinesis & a clear love of terrible puns shown by his nom de guerre, Charlie Watkins was one of Lord Chaos' personal superhuman guard before realizing that his boss was a tyrannical madman; traveling back in time, Killowat tried to stop his world from ever happening. #TitansTogether

Seemingly a pretty cool guy, Garth was murdered by Deathstroke before the events of 'Titans', a tragedy which led to the dissolution of the original Titans team; why they cast a blonde actor, I have no idea. Maybe to evoke Kaldur'ahm? #TitansTogether

A founding Titan who gave up her Amazon-derived powers to keep her son from becoming a despotic future monster, Donna Troy was recruited for the interstellar Darkstar Corps, created by The Controllers to patrol the galaxy in the absence of the Green Lanterns. #TitansTogether

A sudden onset of super-powers led Rachel Roth down the path to a horrible discovery: Her father was a demon!

The murder of her mother led her to seek out Dick Grayson, leading to the reformation of the Titans and four seasons of 'Fuck Batman'-style action-adventure. #TitansTogether

Terrance Bolatinksy is the son of the villain Bolt, inheriting his father's "powers" of electrical engineering and creating his own lightning--throwin' suit.

One of the Terror Titans circa 2008, he is unnecessarily grimdark and obnoxious, which I guess is the same thing. #TitansTogether

The future "drill sergeant" and leader of the most prominent Team Titans squad, Alexander Lyons was the standard tough/strong/fast guy who carried heavy weapons in battle; he, along with most of his future comrades, were erased by the Zero Hour Crisis. #TitansTogether