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Katsuki Bakugou from Boku no Hero Academia/My Hero Academia, it's his childhood nickname that Izuku Midoriya (still) calls him.

"I'm not gonna be your worthless punching bag Deku forever... Kacchan. I'm... I'm the Deku who always does his best!" - Izuku Midoriya
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by journey저니 June 12, 2017
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a Japanese word means a bitch slut who got fucked up in the ass every time she meets a boy
1- whoa look at that girl she's such a kacchan
by dark king rayeligh November 25, 2016
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a great king or ruler that also goes by Lord Explosion Murder. His boyfriend calls him “explosion boy.” He’s beautiful in his own...explosive way.
Kacchan has said once “LORD EXPLOSION MURDER!”
by kirishima July 16, 2018
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