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Benjamin Krupp

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Benjamin Krupp


Mean, grumpy, hot-tempered, bossy, cruel
Ms. Ribble, Miss Anthrope, All Teachers
Everyone else (including George and Harold)
Kipper Krupp (nephew)
Giving detentions, being mean
Children (mainly George and Harold), laughter, smiling, Captain Underpants comics
C krupp

Mr. Krupp in his 2 egos: as a principal, and as Captain Underpants.

Principal Benjamin "Benny" Krupp is the principal of Jerome Horwitz Elementary School. He has a long and bitter history with two fourth grade students named George and Harold due to their constant pranks, wisecracks, and comic books. Because of the effects of a 3-D Hypno-Ring, Mr. Krupp's alter ego is Captain Underpants, which he is totally unaware of. 



Mr. Krupp is an unbelievably mean principal. He distributes detention slips to any student doing for even the most minor infraction, but just so long as they are unfortunate enough to cross his path and he has proof they did do so (though in one case, he punished George and Harold by not allowing them to have cafeteria food even though he had no actual proof). He once blackmailed George and Harold into doing all his daywork in exchange for not getting "killed every day for the rest of their lives". He even tore out the last seven pages of a book from his childhood, "How The Grinch Stole Christmas", to make the plot sound more realistic, assumingly cutting the book off right before the Grinch's heart grows.

His hatred towards George and Harold goes to the point where he tries to find a way to get rid of them (even if it meant that they would be killed) or (to a lesser extent) separate them somehow. In the ninth book, he was greatly happy that Tippy Tinkletrousers was going to destroy the duo and willingly told the Turbo Toilet 2000 where George and Harold hang out in the eleventh book, so they would be gone. Also when George and Harold flunked their "Super Secret" tests, Mr. Krupp and the faculty were greatly overjoyed that Harold flunked the fourth grade because that would mean he and George would no longer be in the same grade and thus have completely different paths.

Despite being really mean, Mr. Krupp does show forms of kindness. He will readily punish anyone who is bullying his nephew Kipper. Kipper just needs to yell out for his uncle and explain to him what happened though Kipper usually makes it look like he was bullied in front of his uncle (For example: after Kipper punched a little girl in the stomach, Kipper claimed to his uncle that the girl's stomach hit his first). Mr. Krupp always believes his nephew's claims no matter how illogical they would seem.

Mr. Krupp also cares about his job as he feared he would lose his job in the second book after seeing the school destroyed by the Talking Toilets until George and Harold managed to fix the school. Additionally, when Tippy Tinkletrousers unintentionally changed the past, he unintentionally caused Mr. Krupp to be fired from his post as principal. Mr. Krupp was shown shedding a tear as he was walking away with his "Krupp Stuff."

Depiction in the Film


  • Mr. Krupp's short name, Benny Krupp, is a pun on the word "bankrupt."
  • As revealed in Captain Underpants and the Wrath of the Wicked Wedgie Woman, Mr. Krupp is Jewish.

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