Thanks to Steel!

Beast Boy has the unusual ability to morph into any animal that he chooses, even extinct varieties such as the Tyrannosaurus Rex. The lighthearted jokester of the group, Beast Boy's cheerful outlook on life combined with his silly humor help to lighten up the atmosphere when things get grim around the Tower. While he sometimes gets on his teammates' nerves with his annoying wisecracks, erratic behavior (like always borrowing Cyborg's stuff and then losing it), and idiotic pranks, he is very valuable both in battle and as a companion and friend.

Beast Boy's relationship with fellow Teen Titan Terra went from good, to bad, to good, to horrible. Though they both cared for each other, Terra's betrayal of the Titans drove them too far apart, until the very end. The two embraced one last time before Terra sacrificed herself to save the city and it's inhabitants.