ARENA 01:
[Tachibana Kanade] Nakagawa Kanon
ARENA 02: Suzutsuki Kanade
[Victorique de Blois]
ARENA 03:
[Makise Kurisu] Konoe Subaru
ARENA 04: Honma Meiko
[Yui]
ARENA 05: Iwasawa Masami
[Tōwa Erio]
ARENA 06:
[Kirishima Shōko] Irisviel von Einzbern
ARENA 07: Haqua du Lot Herminium
[Yuzuriha Inori]
ARENA 08: Kuroi Mato
[Gasai Yuno]
ARENA 09: Shiomiya Shiori
[Hasegawa Kobato]
ARENA 10: Gokō Ruri (Kuroneko)
[Fear Kubrick]
ARENA 11:
[Mikazuki Yozora] Himeji Mizuki
ARENA 12:
[Kanzaki H. Aria] Aragaki Ayase
ARENA 13:
[Mine Riko] Charlotte Dunois
ARENA 14:
[Haruna] Eucliwood Hellscythe
ARENA 15:
[Nakamura Yuri] Elucia de Lute Ima
ARENA 16:
[Sakura Kyōko] Akemi Homura
ARENA 17:
[Kōsaka Kirino] Shimada Minami
ARENA 18:
[Kasugano Sora] Kashiwazaki Sena
ARENA 19: Kawazoe Tamaki, Isayama Yomi
[Konpaku Yōmu, Konohana Lucia]
ARENA 20:
[Shana] Konjiki no Yami
ARENA 21: Shirai Kuroko
[Saber]
ARENA 22: Illyasviel von Einzbern
[Furukawa Nagisa]
ARENA 23: Kotobuki Tsumugi
[Suzumiya Haruhi]
ARENA 24:
[Fujibayashi Kyō] Louise Vallière
ARENA 25:
[Holo] Last Order
ARENA 26:
[Izumi Konata] Oshino Shinobu
ARENA 27:
[Katsura Hinagiku] Shiina Mafuyu
ARENA 28:
[C.C.] Nagato Yuki
ARENA 29:
[Misaka Mikoto] Nymph
ARENA 30: Sakagami Tomoyo
[Ikaros]
ARENA 31: Hirasawa Yui
[Hiiragi Kagami]
ARENA 32: Asahina Mikuru
[Akiyama Mio]
ARENA 33: Index L. Prohibitorum
[Nakano Azusa]
ARENA 34: Tōsaka Rin
[Sanzen'in Nagi]
ARENA 35: Hirasawa Ui
[Aisaka Taiga]
ARENA 36: Sengoku Nadeko
[Hecate]
ARENA 37:
[Ichinose Kotomi] Senjōgahara Hitagi
ARENA 38:
[Morimiya Yorito, Morimiya Aono] Nagase Jun'ichi, Nagase Minato
Go Kyōko! Show them who's the best Mahou Shoujo (in ISML 2012. Nanoha and especially Fate are still the best of course
)!
I remember hating the Akene-iro ni Somaru Saka ending, so I'm voting against mainly Minato.