Board Thread:Questions and Answers/@comment-7083810-20130726172259/@comment-1362555-20130817205750

Slash might have some development where he has a problem deciphering right and wrong. I like Slash and I don't really care whether he's a hero or a villain.

Also, it would make sense because he is Raph's mutated turtle in this version and animals don't usually have a sense of morality, so Slash is likely to make a few mistakes and accidentally do something very bad.