No one roleplays in city RPGs it's just one big deathmatch. How about drugs like steroids that just increase your melee attack damage. Or beer that increases your health. Speed which increases your speed. Etc, etc, etc, etc.
i can image whatit gonna be like..."HAAHH IM SO COOL BECUASE IM DOING DRUGSSEV WEYYEWTHH HAAHAH!"!"!"