Grand Theft Auto V co-writer Dan Houser explained that Trevor "appeared to [Rockstar] pretty much out of nowhere as the embodiment of another side of criminality [..] If Michael was meant to be the idea of some version of criminal control [..] what about the guy who didn't do that?"[REF]
Rockstar drew upon game protagonist archetypes during the scripting the characters; Trevor was considered to embody insanity.