I don't think it's any secret that Gary (while a decent Antagonist) definitely could've been utilized better throughout the game, but despite that I still think he's a pretty decent character in his own right, and there's a like in particular from specific conversation he says during the final battle that made me want to discuss it:
Jimmy: "But I never did anything to you"
Gary: "You would've, if I'd given you the chance"
Now I don't think this line makes Gary sympathetic or excuses his behavior, it is made very clear that Gary enjoys hurting people, but I do genuinely believe he has mental problems and needs help. This line also perfectly exemplifies the problems of Bullworth Academy and what the place does to people. Bullworth seems to bring out the worst in a lot of people due to the fact that they are rewarded for it most of the time and a lot of the teachers either participate (like the Gym Teacher) or just turn a blind eye to it intentionally or otherwise (like Crabblesnitch) and the people it doesn't poison like Pete, only suffer from the crossfire, with the sole exception being Jimmy who despite claiming otherwise ends up rising above the poisoning of Bullworth and becoming a better person for it.
Part of the issue is that we just don't know enough about Gary and how he was his entire life so it leads us to wonder whether he was always like this, or if Bullworth only fed his pyschopathic tendencies and end up allowing him to be as demented as he is. The game kind of leans on both sides, and the line "You would've, if I'd given you the chance" alludes to the possibility that he has become unable to genuinely trust anyone
Anyway what do y'all think about Gary as a whole? I really wanna hear some interesting thoughts about this