ARENA 01:
[Sakagami Tomoyo] Haruna
[Fate Testarossa] Anya Alstreim Tachibana Kanade Matō Sakura Kushieda Minori
ARENA 02: Eucliwood Hellscythe
[Yagami Hayate] Louise Valličre Illyasviel von Einzbern Kawashima Ami Sunohara Mei
[Shiina Mafuyu]
ARENA 03: Tōsaka Rin Asahina Mikuru Furude Rika
[Shirai Kuroko] Minami Chiaki Fujibayashi Ryō
[Gokō Ruri (Kuroneko)]
ARENA 04: Furude Hanyū Aisaka Taiga Hiiragi Tsukasa
[Fujibayashi Kyō] [Hirasawa Ui] Victorique de Blois Kyon no Imōto
ARENA 05: Evangeline A.K. McDowell Ibuki Fūko
[Holo] Last Order
[Akiyama Mio] Kuroi Mato Sakura
ARENA 06: Tsuruya
[Kasugano Sora] Tsukimiya Ayu Hirasawa Yui Maria
[Izumi Konata] Misaka Mikoto
ARENA 07: Rias Gremory Nagase Iori
[Nishizumi Miho] [Mikazuki Yozora] Neko Araragi Tsukihi Takenaka Hanbee
ARENA 08: Irisviel von Einzbern
[Nishizono Mio] [Akemi Homura] Kushina Anna Shiomiya Shiori Makise Kurisu Yui
ARENA 09:
[Shirakiin Ririchiyo] Honma Meiko Morgiana Himenokōji Akiko
[Elucia de Lute Ima] Tainaka Ritsu Sanka Rea
ARENA 10: Ayukawa Tenri Konoe Subaru Mōri Ran Ayano Keiko (Silica)
[Kuroyukihime] Saigusa Haruka
[Mine Riko]
ARENA 11:
[Ibara Mayaka] [Kurokami Medaka] Haqua du Lot Herminium Takanashi Rikka Kanoe Yūko Miniwa Tsumiki Araragi Karen
ARENA 12:
[Yūki Asuna] Kirishima Shōko Nyarlathotep
[Kurugaya Yuiko] Momo Belia Deviluke Onjōji Toki Erica Blandelli
Mostly very tough after first 4, but 8 and 10 particularly so
.