Mai-HiME, Gokujou Seitokai Recommendations
Both are set in a high school where the females hold special fighting abilities. Mai-Hime is more magical and contains more serious drama.
When one watches Gokujou Seitokai, one might be reminded of Mai-HiME minus the magical girls. Mainly because of the Absurdly Powerful Student Council overarching theme (and that Kanade may remind you of Mashiro), but the undertones of "let's all be friends and not kill/fight with each other."