Melvin Sneedly (Captain Underpants)

 is a character from the Captain Underpants book series.

Why He Sucks

 * 1) He is an annoying snitch who snitches on kids for no reason!
 * 2) He hates having fun, unlike the other kids.
 * 3) When he got Captain Underpants' powers, he starts to use it for selfish purposes, and it almost got George, Harold, and Krupp killed!
 * 4) He is shown to be hypocritical when he says to the kids "YOU GUYS ARE SO IMMATURE!" despite the fact that he can be immature at times.