To me, Mikono is not an entirely sweet girl. She's a femme fatale in the making. Just look how she has Amata groveling at her feet without making much of an effort...
Okada : Mikono is a bad woman who unknowingly manipulates men. --> femme fatale.
I'm happy because apart from Fujiko, the chicks in Cat's eyes or Cobra and Rue you don't see much of them in animes.