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- Hecatia is the only extra stage boss who has another boss helping her in her battle.
- According to an Interview with ZUN, she's the strongest Touhou character to date, stating: "Since she's an enemy that doesn't play by the rules, you can't even call it a proper match. It's just playing around. She's completely past the level of anyone in Gensokyo or the Lunar Capital."
- Her shirt is written as "welcome ♥ Hell"