History YMMV / CaptainUnderpants

* DesignatedHero: George and Harold have a tendency to slip into this with some of their pranks. In the first book, they cause enough disruption at a school football game to get the school to forfeit it, and subsequently ruin everyone else's day, and Captain Underpants is later created as a result of their attempt to avoid being punished for this. In the second book, they sabotage the school's Invention Convention out of spite, due to them not being allowed to attend following the prank they pulled last year. And in exchange for fixing all the damage done by the villains, they have Mr. Krupp cancel their punishment and let them run the school for the day, during which they sell a lot of the staff's furniture to pay for the party they throw for all of the students. And in the fourth book, they booby-trap the teacher's lounge to get back at Mr Krupp punishing them again. Granted, they do try and stop the villains in every book, but the fact that many of them (the Talking Toilets, Poopypants, Wedgie Woman) appear as a result of George and Harold's actions doesn't help their case.

* JerkassWoobie: Professor Poopypants. He just wanted people to stop laughing at his name.

** In ''Wrath of the Wicked Wedgie Woman'', it's revealed that the ring was recalled because for unknown reasons, it worked the opposite of its intention on women. UnfortunateImplications aside, this might seem like jumping the gun to younger readers, but George and Harold used it on their already-SadistTeacher and [[GoneHorriblyWrong look what happened]]. Now, what about all the other kids who had one? Chances are, the first thing a lot of them would use it on is their parents, who they typically have a [[AdultsAreUseless very low opinion of]]. All of a sudden, there'd be an outbreak of [[AbusiveParents Abusive Mothers]] all across the country because the kids demand that their every whim be catered to. That wouldn't go unnoticed and would be a pretty damn good reason to recall them.

* DesignatedHero: George and Harold have a tendency to slip into this with some of their pranks. In the first book, they cause enough disruption at a school football game to get the school to forfeit it, and subsequently ruin everyone else's day, and Captain Underpants is later created as a result of their attempt to avoid being punished for this. In the second book, they sabotage the school's Invention Convention out of spite, due to them not being allowed to attend following the prank they pulled last year. And in exchange for fixing all the damage done by the villains, they have Mr Krupp cancel their punishment and let them run the school for the day, during which they sell a lot of the staff's furniture to pay for the party they throw for all of the students. And in the fourth book, they booby-trap the teacher's lounge to get back at Mr Krupp punishing them again. Granted, they do try and stop the villains in every book, but the fact that many of them (the Talking Toilets, Poopypants, Wedgie Woman) appear as a result of George and Harold's actions doesn't help their case.

* DoubleStandardAbuseFemaleOnMale: Ms. Ribble/Wedgie Woman's treatment of George and Harold is this. I don't think anyone would laugh if a grown man acted cruel to two fourth grade girls.
** Eh, it wasn't being played for laughs. Additionally, Mr. Krupp was just as mean to them.

* NauseaFuel: Inevitable in ToiletHumour-themed series, but the Bionic Booger Boy gets special mention. His descriptive introduction has George yell at the narrator for making everyone sick.

* WoobieDestroyerOfWorlds: Professor Poopypants. He just wanted people to stop laughing at his name.

* TheWoobie: Professor Poopypants. He just wanted people to stop laughing at his name.

** WoobieDestroyerOfWorlds

* TheWoobie: Professor Poopypants at first.

* {{Squick}}: A grown man runs around in his underwear with two ten-year-old boys.

* doubleStandardAbuseFemaleOnMake: Ms. Ribble/Wedgie Woman's treatment of George and Harold is this. I don't think anyone would laugh if a grown man acted cruel to two fourth grade girls.

* CompleteMonster: Mr. Krupp seems to be this from George and Harold's point of view.
** In Book 8, it is shown that the entire school faculty is this to the rest of the student body, except for Ms Ribble due to having been brainwashed into being kind.
* NauseaFuel: Pretty much inevitable in ToiletHumour-themed series, but the Bionic Booger Boy gets special mention. His descriptive introduction has George yell at the narrator for making everyone sick.

* TearJerker: [[spoiler: The ending of the ninth book didn't exactly make this troper cry, but it was REALLY sad.]]

* {{Squick}}: A grown man runs around in his underwear with two ten-year-old boys.

** In Book 8, it is shown that the entire school faculty is this to the rest of the student body.

* Squick: A grown man runs around in his underwear with two ten-year-old boys.

* NauseaFuel: Pretty much inevitable in ToiletHumour-themed series, but the Bionic Booger Boy gets special mention.

* CompleteMonster: Mr. Krupp is portrayed as one.
* CrowningMomentOfFunny: This exchange after Deputy Dangerous has been turned into Deputy Doo-Doo:
-->'''Deputy Doo-Doo:''' Man, this hill is steep! I'm so tired!
-->'''Danger Dog:''' Are you pooped?
-->'''Deputy Doo-Doo:''' Why, yes, I'm...hey! Shut up!
-->'''Danger Dog:''' Aw, don't be a party pooper!
-->'''Deputy Doo-Doo:''' I said SHUT UP!
-->'''Danger Dog:''' When we get home, will you read me "Winnie The Pooh?"
-->'''Deputy Doo-Doo:''' I'LL KEEEEEL YOU!
* NauseaFuel: Pretty much inevitable in ToiletHumour-themed series, but the Bionic Booger Boy gets special mention.