Rogue

Rogue isolates herself from other people because of her mutant ability, which prevents her from making any physical (skin-to-skin) contact with people.

 

Rogue's isolation leads her to be petulant, sarcastic and alarmingly defensive. As a result of her isolation, Rogue has trouble trusting people. Since joining the X-Men, Rogue has become closest with her roommate Kitty.

 

Although she recently showed interest in Magneto's henchman Gambit, as they both realized that they had a great deal in common (including adopted parents who prefer to nurture their powers rather than them), and are now friends.

 

Rogue is also very intelligent. She had two separate classes with Scott Summers, who is a year older than her, meaning that she has jumped forward a year in at least two of her classes, possibly more. She also seems to be quite well-read.