Board Thread:General Discussion/@comment-34661853-20181025235414/@comment-1038387-20181026093448

Since I am of DC Database, I'll just answer it here.

What Beast Boy can and cannot copy, and how he does it, has always been a bit vague. The "any animal he meets and sees" was a practical restriction added in the Young Justice cartoon. That didn't exist in the comics. Whether he can transform into sentient beings has never been shown, afaik. It stands to reason that he can't; his origin is that he was injected with an antidote containing antibodies of "every living animal" and that mutated with the disease his parents were trying to cure him of, Sakutia. That seems to be his limit. I'm not sure if he has ever changed into a dinosaur in the comics like he did in the Teen Titans TV series.

All of Beast Boy's animals are his color. This was not originally the case; in his original appearances in Doom Patrol, he was purple and all his animals had their normal colors. However, since he became green, all his animals became monochrome green as well - except for a short time in the New 52 in 2011, where he was made red to tie his powers into The Red (the animal counterpart to Swamp Thing's The Green). Which has since been changed back into green without in-universe explanation.