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Getting to know her better, I think you guys were right.
Shiori is that cute, actually-partially-harmless girl who tries so hard to be le quirky. Except she's kept at it for so many years, it's /become/ a part of her so she's cringequirky. She'd be the type to claim to be wiccan or buddhist-"Vegan" but not really that seriously.
Moom is that le quirky girl that gets accused of faking it, but is actually the real deal deep inside. Still somewhat marginally functional, but she can be very very dangerous without knowing it.
Fauna's the one who seems so normal on the outside, because she's perfected being functional. But deep down, she knows she isn't one of "them" but manages to keep it in....for now. She's Dexter Morgan.
Shiori would kill animals for show, dissect them for fun and knowledge.
Moom would kill animals but she doesn't know why she finds it fun.
Fauna kills animals in secret, to sate the thirst. But YOU WILL NEVER KNOW.