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Aooni (青鬼 Aooni) is the namesake, main species and threat found across Aooni and its versions, as well as its subsequent remakes. It is the only Aooni to appear to be found in all versions, as well as the only threat to appear in all areas and modes of the games. In earlier version, it acts as a proper antagonist, but in later versions, its role is slowly phased out as the player progresses through the game, with other threats taking bigger and bigger roles.

Fuwatty (フワッティー Fuwattī), localized as Blockman, is the second main Ao Oni in the series. It first appears in Version 6.23, and has since become the secondary mascot to the series, being the second most reoccuring Ao Oni after Ao Oni itself, taking a variety of roles across the series.