Parodied: The people who use magic aren't good at it, and Bob is a world-class fighter capable of using several different martial arts. However, Bob moans about his lack of magic at any given opportunity.
Zig Zagged: Bob can use magic, but he's not very good at it. At least, that's what he claims...
Bob can use magic.
Bob is an ordinary Muggle and can't hold his own in a fight against magic users.
Enforced: "Well, crap - every other character on this show has some generic magic power, but I can't think of any new powers to give to Bob." "How about you just write it to where he's a really good martial artist?"
"Why haven't you used your magic yet?"
"You have no powers, you took on an insanely powerful supervillain and won!? Damn Bob, you're hardcore."
Invoked: Knowing that he doesn't have magical skills like everyone else, Bob trains harder and becomes a martial arts expert.
Defied: Bob decides to learn magic.
Discussed: "Bob's martial arts skills must be incredible if he can't use magic and is still able to keep with the rest of his team!"
Conversed: "Have you ever wondered how guys with no special abilities can still fight magically-empowered villains and win using nothing more than kung fu?"
Bob's lack of magical prowess is viewed as a handicap by his magic-using peers, given what they face. Whether or not this actually restricts him depends on the degree of cynicism of the story (What? Not every deconstruction needs to be doom and gloom).
Reality Ensues: magic users have a tendency to learn martial arts and tactical thinking as well, in order to give themselves an even greater advantage over others during a real battle. The natural result is that when Bob encounters an enemy who is both equally combat skilled and magically talented, Bob's magical handicap ultimately becomes his undoing and he is vaporized without fanfare.
Bob's lack of magical abilities causes him to develop a crippling inferiority complex, despite his impressive fighting skills. The Verse is split between people who view him as pathetic or underestimate him, and those who view him as a savoir because of his skills, while Bob himself is unable to really appreciate his own contributions.