[quote=@GreivousKhan]

What do you mean by weaknesses exactly? Is it something extra beyond the limitations of a class? 
[/quote]

Rilla basically likes your character to have a couple of things they're worse than average at, unless they're not particularly good at anything, in which case their weakness sort of becomes how mundane they are. 

Also it usually has to be physical so he can pull out some shit to screw you over at some point.