- One of Maeda's best friends. Gets extremely angry whenever someone mentions his wide forehead.
- While the only one with a proper girlfriend in the series, they constantly fight and bicker, each accusing the other of infidelity.
- His father runs a motorbike repair shop and Maeda usually makes Katsuji repair his mopeds and loan him porn movies.
- Katsuji has been best friends with Yoneji since Preschool and, originally, his bully.
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Katsuji appears in "Jump Ultimate Stars" as a helper in battle