Well, Koishi's been a bit of a bitch this whole series (everything I've seen this artist do, actually), the whole premise here is that she sneaks into people's homes, steals their food, then insults them (whether to their face or just to herself) for not having good enough service.
Meanwhile, Satori (who I think gets portrayed as villainous far too easily just because of her power) has pretty much never caused a problem for anybody, and largely seems to just want to live a peaceful life with her family of adopted misfits.
Not a bitch per say just alittle self absorbed and lonesome. Keep in mind she hasn't outright offended anyone.
Wait, Koishi!KOISHI!Calm down. It's dinner time.Let's eat something warm and talk about it later.Oh, give me a break.It's so depressing living here! Even when I'm eating, even when I'm calm, I've never felt at peace!No one would mind if we were away for ten or twenty years.Loving pets aren't enough. I feel so lonely here.Those underground folks made us do this boring chore in exchange for letting us in, as if they have any say in it.I don't like it. I don't like wasting my life here at all.