*Vermeil is the lead female protagonist of the Kinsou no Vermeil series. She is a devil who has features of a succubus, though it is not yet known if she actually is one. She enters the story by being summoned by Alto Goldfield from a book that she was imprisoned in three centuries ago. She is considered powerful even by devil standards, able to destroy a city with a single attack if pushed hard enough.

Vermeil is a tall and curvaceous woman with shoulder length violet hair, deep vermilion eyes, horns, a spade-shaped tail, small fangs and pointy ears. She can conceal her non-human aspects at will so as to disguise herself as a human. She usually wears a short black one-piece dress (originally Alto's sister's).

Her huge breasts are perhaps her most obvious feature, and she is quite proud of them. After the battle with Obsidian resulted in her clothes being destroyed, Vermeil wore the female student uniform (though the shirt doesn't close in the front due to the size of her breasts keeping the buttons from reaching) until a new black dress from Alto's sister arrived.

Vermeil is an easy-going devil who tends to be straightforward and bold in her behavior, including entering the boys' changing room without hesitation. Modesty and personal space are somewhat foreign concepts to her, and she has no issue with nudity (indeed being perplexed that Alto wants her to wear clothes at all).

She always comes off as having a lewd streak, being extremely flirtatious and lustful with Alto Goldfield, her summoner, and even says she feels ecstatic whenever she tastes/feels his golden mana. She caresses, gropes, and simply cuddles with him on a frequent basis*