Mikami was only stupid because he was too overzealous about the plan running smoothly.>>10891933>>The rest of the cast has standards, ideals, and coherent ways of seeing the world, whereas Misa is just a ditzy airhead.
Misa is not ditzy, although she acts cute. She may not be as smart as Light, L, Mikami, Mello and Near, but she could hold her own.
Her goal was to pledge undying love and loyalty to the man who killed the killer of her parents. For Misa, Light looked like a damn superhero to her. She knew she was being used, hell, she told him to use her.