Concerning leveling benefits, I think girls should gain higher skill caps, or 'power ups' or both. I'm against traits, as many traits represent things you cannot learn (unless we say it happens through "magic", at which point any further explanation is futile). Power-ups (we could also use the word feats) could be organized in trees and grant skill cap increases or skill boni that can raise the current skill level above the cap, or provide new skills to use (like Otherworlds classes do). If we decide to have power-ups, I would vote for turning learnable traits into power-ups (example: "Seductress" could be a power-up as you can learn to seduce people; "Angelic beauty" could not be a power-up as you cannot learn to look like an angel. You either do, or you dont). I think sibr1x had a power-up tree which I liked. We could do something similar :-)