Has it ever occurred to you that the majority of female chuubas are probably tomboys/tomboyish, regardless of how girly the characters may be? It makes sense when you think about it. Chuubas are like comedians - in order to have the charisma to entertain a male audience, they have to be "one of the guys". Is it a coincidence that men think women are boring and female comedians aren't funny? So why are chuubas different? The only explanation is their tomboy nature.