I don't like Trevor either and the biggest issue for me is he has absolutely 0% of character creation.
He was created as a Frankenstein's monster trying to combine every trait of well known psycho characters in order to make him cool and edgy, but it totally backfired in my opinion as there is not much Trevor in Trevor. He's basically Murdoc (A team) combined with Lynch (Kane & Lynch series) combined with Kano (Mortal Kombat series) combined with Blanka (Street Fighter) and probably someone else who I forgot to mention.
Only moments in the game when we may see the true Trevor is when he's crying (after seeing his mother, in Something Sensible ending and Bury the Hatchet mission), when all the traits taken from various characters are not covering his true self.
When we met Brucie it's clear from the start he has a narcissism, but apart from that he has actual personality. Sure he's loud, obnoxious and fuelled by roid rage, but you can see that there is something more to him.
Trevor on other hand is clearly based on something called Borderline Personality Syndrome and his every act and thought in the game is taken from said illness. It creates quite funny paradox, because character with no personality has a personality disorder.
To be diagnosed with aforementioned syndrome, you have to show 3 of 10 of specific signs, yet Trevor has all of them at the same time. In real life he would be closed in psychiatric hospital for rest of his life as extremely specific case not able to live in society, but here he's cool and funny protagonist.
Here are the signs if someone is wondering and please tell me they don't fit Trevor:
- Markedly disturbed sense of identity
- Frantic efforts to avoid real or imagined abandonment and extreme reactions to such
- Splitting ("black-and-white" thinking)
- Impulsivity and impulsive or dangerous behaviours
- Intense or uncontrollable emotional reactions that often seem disproportionate to the event or situation
- Unstable and chaotic interpersonal relationships
- Self-damaging behavior
- Distorted self-image
- Frequently accompanied by depression, anxiety, anger, substance abuse, or rage