>>29927043I think I project a bit too much headcanon on her, but I like how she's almost unflinching stoic and yet you can tell what emotion she's feeling from her mannerisms. She emphasizes when angry, laughs when happy, talks almost in a sing song way when she's being menacing and threatening you. Also her obsession with wanting to beat you can make some nice scenarios when she finally does.
tl;dr, it's fun to fantasize about being on your knees at her mercy while she ponders your fate with cold eyes and a tiny smirk.