Sheila is a very timid and very polite Hater demon who took on the form of a mermaid.

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"When my body hurts and I'm in pain... Sometimes I think about strange things. I remember things from a distant past. Even though I know it's better to forget them.."

Image Source: https://m.youtube.com/watch?v=xt1VtaXdaUM&list=PLq7Wze90TsOra54JLVEzrQL7vreZoPv8G&index=13&pp=iAQB (7:20 mark)