Arena 1 was a bit hard. I don't like and I don't dislike both Kuroneko and Kanade, so I guess abstaining would be best. But since I dislike abstaining I went for Kanade in the end, since I think she deserves it more after destroying so many girls.
Arena 2 was really easy. Go Taiga!
ARENA 01:
[Tachibana Kanade] Gokō Ruri (Kuroneko)
ARENA 02: Misaka Mikoto
[Aisaka Taiga]
ARENA 03: Isanami
[Rias Gremory] Shirakiin Ririchiyo
ARENA 04: Henrietta de Tristain Tachibana Miya
[Yamano Lemon]
ARENA 05: Araragi Tsukihi Sonya
[Tanamachi Kaoru]
ARENA 06: Akazawa Izumi Mishima Nana
[Tōjō Koneko]
ARENA 07: Urabe Mikoto Xiao-Mei
[Yoshida Yuki]
ARENA 08: Coco Eureka
[Sanka Rea]
ARENA 09:
[Kanoe Yūko] SG550 Tokura Misaki
ARENA 10: Furuya Mero
[Ibara Mayaka] Satō Masaki