I use all of them but i don't like how most of them work. I don't avoid any though. My least favorites are bro and clumsy.
I think (i may be wrong) that bro doesn't improve the fitness skill faster. What i've notice is that bros like to watch sports on tv and like to be around other bros... i don't know...i don't get it...is it representing sports fans? If so i think the game isn't in line with it, being that you can only watch sports on tv... another trait that i find a misuse of the so few traits we have is clumsy... it does nothing actually... it isn't even funny imo...