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The Leader: She appears to be the leader of the Grimwood Girls.Heroic Willpower: Even Revolta was impressed by how much effort it took to place Sibella under mind control.Graceful Ladies Like Purple: With the exception of her eyes and lips, her entire color palette consists of different shades of purple.Girly Girl with a Tomboy Streak: She definitely shows this given her interest in volleyball, and her willingness to show a competitive streak.Fur Against Fang: She appears to have a friendly rivalry with Winnie, as shown when she calls her a show off, and when she decides to take up her offer of a race to change into a bat.
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Friendly Neighborhood Vampire: She's a vampire girl who's amiable and kindhearted.Final Girl: She is the last of the girls to be captured by Revolta.Exact Words: She takes up Winnie's offer of a race to stretch her wings instead of her legs, allowing her to get an unfair advantage.Dhampyr: Is implied to be this seeing as she seems unharmed by sunlight (but is presumably still weak to garlic since it's the only topping her pizza doesn't include).Deadly Dodging: How she manages to lose the spiderbats at one point, by tricking them into colliding with each other.Daywalking Vampire: She is a vampire who doesn't have any problem going about in sunlight.Cute Monster Girl: She's a friendly vampire and she has light purple skin.Cute Little Fangs: Being a vampire girl, it would make sense that she'd have tiny fangs that compliment her cuteness.Big Sister Instinct: She seems to have this, trying to warn Tanis and Elsa not to go near the shack or Winnie and Phantasma.Amazing Technicolor Population: She and her father have purple skin.Action Girl: She managed to put up a very strong fight in bat form against Revolta's minions.She's very sultry, and possibly the strongest of the girls, able to nearly fight off the spider-bats when the others couldn't. She is helpful, polite, and while being a monster, is very sweet and the most easygoing of the girls. Despite being one of the quietest, calmest girls, Sibella appears to be the leader of the bunch, as well as the oldest.