[Eater of All]

Spoiler for Votes:

ARENA 01: Nakamura Yuri Aisaka Taiga [Eucliwood Hellscythe] Shana Tachibana Kanade Misaka Mikoto Kōsaka Kirino
ARENA 02: Fate Testarossa Araragi Karen Katō Marika [Ibuki Fūko] Takanashi Miu Hiiragi Kagami Akemi Homura
ARENA 03: [Takamachi Nanoha] Araragi Tsukihi Chiaki Kurihara Okazaki Ushio Takanashi Sora Izumi Konata Furude Rika
ARENA 04: [Misaki Mei] Aragaki Ayase Ayuzawa Misaki Last Order Kinoshita Yūko Inui Sana Millhiore Firianno Biscotti
ARENA 05: Gasai Yuno [Honma Meiko] Mine Riko Himeji Mizuki Hecate Shiina Mafuyu Kotobuki Tsumugi
ARENA 06: [Nanasaki Ai] Haibara Ai
ARENA 07: [Oikawa Tsurara] Kuchiki Rukia
ARENA 08: [Yamada Aoi] Sōryū Asuka Langley
ARENA 09: [Otonashi Io, Miniwa Tsumiki] Niiya Teiichi, Kanoe Yūko

Best end would be Eu for the necklace, but that's probably difficult. Kanade getting it would be fine too I suppose, even if her getting trolled out of it again would be entertaining.