Kurt Wagner is a high-school sophomore who'd love to be a swashbuckler like Luke Skywalker or Neo. Instead, he's the kind of alien-lookin' freakboy who'd be rejected from the Star Wars cantina because: a) he's too darn freaky lookin', and b) he's underage.

Kurt excels at soccer and gymnastics -- no shock there. When playing soccer at the Mansion, he tends to cheat by passing the ball (BAMF!) to himself. The others don't mind -- because they cheat, too: Jean uses her TK to maneuver the ball, and Scott may nail it with his eye-beams. (Pop! "Ooops! My bad!") Of course, the Professor encourages all this, because it's an enjoyable and natural way for his students to refine their powers.

Although Kurt has a demonic appearance, he is actually the sweetest, most vulnerable, most  human of the group. When those around him are feeling down, Kurt is the quickest to pick up on it. And because of his appearance, he feels the most isolated from people in general. How would he be judged if they saw the way he really looked?

Far from being glum, Kurt buries his potential (please pardon the expression) blue streak by displaying a wicked sense of humor. He always plays practical jokes, especially on "big brother"  Scott (who remains ever the good sport).
 As Kurt is the team's acrobat, he is the one with the greatest joi de vivre -- approaching situations (even dangerous ones) with zeal and zest (although he is neither flippant nor arrogant about it).

By virtue of a holographic inducer, Kurt can attend the regular school. But he lives in fear of his inducer going on the fritz, and the other kids finding out about his true appearance and labeling  him a total freak. (His fear comes
largely from the fact that Kitty is having a problem overcoming her heebie- jeebies at the sight of him.)
Because his holographic inducer is purely visual, Kurt always must be careful about coming into contact with people. If they were to touch his face, they would feel his fur. If he were to hold hands with somebody, they would feel that he has only three fingers. And of course, this technology does have a tendency to go on the fritz. Fortunately, Kurt can teleport -- thus protecting his secret while leaving the people he left behind very confused.

Kurt's outer jovial nature is largely a mask to hide his biggest fear: being rejected as a freak. His own mother rejected him -- and now he's afraid nobody else will be able to love him, either. We got to see Kurt's fear in action in "Mainstream", he got to the point that he pretended not to know the X-men.