Re: Marvel's Rogue
Sorry if this has been suggested, but I read a few replies and thought that one good way to offset Rogues great power is to recreate her reasons for not liking to use it.
Maybe run the risk of keeping disadvantages permanently, especially psych lims. Also, keep in mind she runs the risk of "berserk," that is the absorbed persona could take over. This could be simulated in degrees, with stronger, more alien or evil personas causing a drop in her effectiveness.
Maybe a permanent tally of all absorptions, sort of like a sanity score in CoC, and once she reaches a certain point she's permanently cuckoo.
The truth is Rogue didn't use her power casually, at least not when I was reading X-Men, not by a long shot. She only used them when necessary.
That said, she was overpowered.