Fenris, the giant solid block of inhibitions and fortress-like walls around his personal space...
Fenris will be less likely to hold back his magical glowy fisting trick if instigated. He will also be more likely to open up about his past as a slave when asked. He's normally pretty honest regardless, but he will be more likely to actually say what's on his mind rather than filing it away under "not important, no reason to say this."
He's noooot prone to physical intimacy, though. In fact, he actively shies away from it. So I suppose if it happens, he won't punch you in the face for it LMFAO...