For one reason or another, Mito-san hasn't been able to find her own happiness with someone she truly cares about, so she chooses to support the muscle-brains on their quest of sweaty love. However, because she's a bit on the damaged side, her methods often have unwanted side-effects. Her personality meshes well with the gyaru girls, but I think she tries to be a good person, in her own way. I don't think Mito has any romantic attraction towards anyone that we've seen thus far.