Dragged Into Drag: A couple of times, Kenan's plans require a girl, which means Kel has to dress up as one. People can't seem to see through the disguise, either (even when he pretended to be pregnant!).
Only Chris seems to noticed.
G-Rated Drug: Kel's addiction to Orange Soda. There's even an episode dedicated to everyone trying to break his addiction.
Genius Ditz: Kel scored a 98 (out of 100, on this show) on the IQ Test.
I Warned You: He always tells Kenan his plans won't work, but Kenan never listens and doesn't want to hear of it even when his plans do fail.