SPOILER
I don't know much about many of these characters.ARENA 01: [Kirishima Shōko] Takakura Himari
ARENA 02: Morishima Haruka [Abstained] Reki
ARENA 03: Ayase Chihaya [Abstained] Haqua du Lot Herminium
ARENA 04: Takahara Ayumi [Abstained] Yarizui Sen
ARENA 05: Konoe Subaru [Abstained] Shinonome Nano
ARENA 06: Minato Tomoka [Abstained] Sena Airi
ARENA 07: Amaha Miu [Abstained] Hotogi Shirayuki
ARENA 08: Kisaragi Chihaya [Abstained] Nakagawa Kanon
ARENA 09: Hakamada Hinata [Tsugumi]
ARENA 10: Oshimizu Nako [Abstained] Sakura Kyōko
ARENA 11: Fear Kubrick [Abstained] Shinonome Hakase
ARENA 12: Laura Bodewig [Abstained] Taneshima Poplar
ARENA 13: Gasai Yuno [Abstained] Kunieda Aoi
ARENA 14: [Ika-Musume] Tsurugi Minko
ARENA 15: Horizon Ariadust (P-01s) [Abstained] Kaname Madoka
ARENA 16: Kasugano Sora [Abstained] Oikawa Tsurara
ARENA 17: Hyūga Hinata [Abstained] Ikaros
ARENA 18: Kanzaki Kaori [Saten Ruiko]
ARENA 19: [Furude Rika] Kinomoto Sakura
ARENA 20: [Hiiragi Kagami] Shinku
ARENA 21: Kuronuma Sawako [Abstained] Sanzen'in Nagi
ARENA 22: Lucy Heartfilia [Abstained] Maria
ARENA 23: [Kawashima Ami] Ryōgi Shiki
ARENA 24: Konjiki no Yami [Suigintō]
ARENA 25: [Asahina Mikuru] Kamio Misuzu
ARENA 26: [Ryūgū Rena] Sakurano Kurimu
ARENA 27: Enma Ai [Index L. Prohibitorum]
ARENA 28: [Kawasumi Mai] Yūki Mikan
ARENA 29: Chrome Dokuro [Fate Testarossa]
ARENA 30: [Evangeline A.K. McDowell] Shirai Kuroko
ARENA 31: [Ayanami Rei] Shiina Mafuyu
ARENA 32: [Ibuki Fūko] Yin
ARENA 02: Morishima Haruka [Abstained] Reki
ARENA 03: Ayase Chihaya [Abstained] Haqua du Lot Herminium
ARENA 04: Takahara Ayumi [Abstained] Yarizui Sen
ARENA 05: Konoe Subaru [Abstained] Shinonome Nano
ARENA 06: Minato Tomoka [Abstained] Sena Airi
ARENA 07: Amaha Miu [Abstained] Hotogi Shirayuki
ARENA 08: Kisaragi Chihaya [Abstained] Nakagawa Kanon
ARENA 09: Hakamada Hinata [Tsugumi]
ARENA 10: Oshimizu Nako [Abstained] Sakura Kyōko
ARENA 11: Fear Kubrick [Abstained] Shinonome Hakase
ARENA 12: Laura Bodewig [Abstained] Taneshima Poplar
ARENA 13: Gasai Yuno [Abstained] Kunieda Aoi
ARENA 14: [Ika-Musume] Tsurugi Minko
ARENA 15: Horizon Ariadust (P-01s) [Abstained] Kaname Madoka
ARENA 16: Kasugano Sora [Abstained] Oikawa Tsurara
ARENA 17: Hyūga Hinata [Abstained] Ikaros
ARENA 18: Kanzaki Kaori [Saten Ruiko]
ARENA 19: [Furude Rika] Kinomoto Sakura
ARENA 20: [Hiiragi Kagami] Shinku
ARENA 21: Kuronuma Sawako [Abstained] Sanzen'in Nagi
ARENA 22: Lucy Heartfilia [Abstained] Maria
ARENA 23: [Kawashima Ami] Ryōgi Shiki
ARENA 24: Konjiki no Yami [Suigintō]
ARENA 25: [Asahina Mikuru] Kamio Misuzu
ARENA 26: [Ryūgū Rena] Sakurano Kurimu
ARENA 27: Enma Ai [Index L. Prohibitorum]
ARENA 28: [Kawasumi Mai] Yūki Mikan
ARENA 29: Chrome Dokuro [Fate Testarossa]
ARENA 30: [Evangeline A.K. McDowell] Shirai Kuroko
ARENA 31: [Ayanami Rei] Shiina Mafuyu
ARENA 32: [Ibuki Fūko] Yin