Minor recurring characters in High School DxD.
- Drag So-Ball is based off of Akira Toriyama's hit manga Dragon Ball. In addition, Satoru Soramago, Dells, and the Goki Dama are all based based off of Son Goku, Frieza, and the Spirit Bomb (Genki Dama) respectively.
- The Familiar Master, Zatouji, is a parody of Ash Ketchum/Satoshi of Pokemon/Pocket Monsters fame, right down to his catchphrase "Get da ze!" (Gotta catch 'em all!) and even his appearance in the anime.
- The Gentleman Alchemist bears a striking resemblance to Count Dracula.
- Issei compared Kiyome Abe's father appearance to Raoh from the Fist of the North Star series.
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