Here's whom I voted for:
ARENA 01: [Yūki Asuna] Araragi Karen
ARENA 02: [Kirigaya Suguha] Konoe Subaru
ARENA 03: Roromiya Karuta [Ayano Keiko (Silica)]
ARENA 04: Misaki Mei [Kuroyukihime]
ARENA 05: [Araragi Tsukihi] Nōmi Kudryavka
ARENA 06: Kurasaki Fūko (Sky Raker) [Yuzuriha Inori]
ARENA 07: Yui [Natsume Rin]
ARENA 08: Kotegawa Yui [Chitanda Eru]
ARENA 09: [Makise Kurisu] Tōwa Erio
ARENA 10: [Kashiwazaki Sena] Akemi Homura
ARENA 11: [Honma Meiko] Nibutani Shinka
ARENA 12: Sanka Rea [Mikazuki Yozora]
ARENA 13: [Kanzaki H. Aria] Aoyama Nanami
ARENA 14: Shirakiin Ririchiyo [Takanashi Rikka]
ARENA 15: Nyarlathotep [Shiina Mashiro]
ARENA 16: Momo Belia Deviluke [Hasegawa Kobato]
ARENA 17: [Oshino Shinobu] Yūki Mikan
ARENA 18: Takanashi Tōka [Kirishima Shōko]
ARENA 19: Matsumi Yū, Hirose Sumire [Suigintō, Shinku]
ARENA 20: [Tachibana Kanade] Victorique de Blois
ARENA 21: [Shana] Hirasawa Ui
ARENA 22: Furukawa Nagisa [Hirasawa Yui]
ARENA 23: Tōsaka Rin [Gokō Ruri (Kuroneko)]
ARENA 24: [Fujibayashi Kyō] Sengoku Nadeko
ARENA 25: Holo [Kōsaka Kirino]
ARENA 26: [Yui-nyan] Nagato Yuki
ARENA 27: Aragaki Ayase [Misaka Mikoto]
ARENA 28: [Senjōgahara Hitagi] Sakagami Tomoyo
ARENA 29: [Akiyama Mio] Izumi Konata
ARENA 30: [Last Order] Saber
ARENA 31: Nymph [Nakamura Yuri]
ARENA 32: C.C. [Suzumiya Haruhi]
ARENA 33: Charlotte Dunois [Eucliwood Hellscythe]
ARENA 34: [Iwasawa Masami] Aisaka Taiga
ARENA 35: Louise Vallière [Nakano Azusa]
ARENA 36: [Kuroi Mato] Katsura Hinagiku
ARENA 37: Konjiki no Yami [Illyasviel von Einzbern]
ARENA 01: [Yūki Asuna] Araragi Karen
ARENA 02: [Kirigaya Suguha] Konoe Subaru
ARENA 03: Roromiya Karuta [Ayano Keiko (Silica)]
ARENA 04: Misaki Mei [Kuroyukihime]
ARENA 05: [Araragi Tsukihi] Nōmi Kudryavka
ARENA 06: Kurasaki Fūko (Sky Raker) [Yuzuriha Inori]
ARENA 07: Yui [Natsume Rin]
ARENA 08: Kotegawa Yui [Chitanda Eru]
ARENA 09: [Makise Kurisu] Tōwa Erio
ARENA 10: [Kashiwazaki Sena] Akemi Homura
ARENA 11: [Honma Meiko] Nibutani Shinka
ARENA 12: Sanka Rea [Mikazuki Yozora]
ARENA 13: [Kanzaki H. Aria] Aoyama Nanami
ARENA 14: Shirakiin Ririchiyo [Takanashi Rikka]
ARENA 15: Nyarlathotep [Shiina Mashiro]
ARENA 16: Momo Belia Deviluke [Hasegawa Kobato]
ARENA 17: [Oshino Shinobu] Yūki Mikan
ARENA 18: Takanashi Tōka [Kirishima Shōko]
ARENA 19: Matsumi Yū, Hirose Sumire [Suigintō, Shinku]
ARENA 20: [Tachibana Kanade] Victorique de Blois
ARENA 21: [Shana] Hirasawa Ui
ARENA 22: Furukawa Nagisa [Hirasawa Yui]
ARENA 23: Tōsaka Rin [Gokō Ruri (Kuroneko)]
ARENA 24: [Fujibayashi Kyō] Sengoku Nadeko
ARENA 25: Holo [Kōsaka Kirino]
ARENA 26: [Yui-nyan] Nagato Yuki
ARENA 27: Aragaki Ayase [Misaka Mikoto]
ARENA 28: [Senjōgahara Hitagi] Sakagami Tomoyo
ARENA 29: [Akiyama Mio] Izumi Konata
ARENA 30: [Last Order] Saber
ARENA 31: Nymph [Nakamura Yuri]
ARENA 32: C.C. [Suzumiya Haruhi]
ARENA 33: Charlotte Dunois [Eucliwood Hellscythe]
ARENA 34: [Iwasawa Masami] Aisaka Taiga
ARENA 35: Louise Vallière [Nakano Azusa]
ARENA 36: [Kuroi Mato] Katsura Hinagiku
ARENA 37: Konjiki no Yami [Illyasviel von Einzbern]