I love the characters Shion and Milim. Both of them happy-go-lucky, bubbly girls who are extremely powerful; without having the trope of "innocent devil" or "purity sadist". That juxtaposition is one I care a lot for. Typically it's only used for the 'older sister' characters, so when it's displayed as a normal character it makes me happy to see.
I wonder if that's a fetish?