Two (three after the edit) calls I think; Pink hair in the upper-right-middle is Birdy; post #1373330 and I think fox-ears sketch on the extreme right-middle is Caster-Extra/CCC. I thought the person below-left of Enja might be Black Rose from .hack, or one of her several clones from the other stories, but the facial tattoos don't match.
Directly above professor Layton looks like Asuka. Makes sense since in a waifu pic Rei is there.
Takanashi Rikka (Chuunibyou Demo Koi ga Shitai!)Suiseiseki (Rozen Maiden)Laura Bodewig (Infinite Stratos)Yin (Darker Than Black)Madotsuki (Yume Nikki)Ikamusume (Shinryaku! Ikamusume)Ryuuguu Rena (Higurashi no Naku Koro ni)Hirasawa Yui (K-On!)Tohsaka Rin (Fate/stay night)Enja Niuhali (Lotte no Omocha!)Akemi Homura (Puella Magi Madoka Magica)Izayoi Sakuya (Touhou)Miki Sayaka (Puella Magi Madoka Magica)Ayanami Rei (Neon Genesis Evangelion)Desco (Disgaea)Professor LaytonKonoe A. Mercury (Blazblue)Nefelpitou (Hunter X Hunter)Platinum the Trinity (Blazblue)Kirijo Mitsuru (Persona)Lucina (Fire Emblem)Noel Vermillion (Blazblue)Pleinair (Disgaea)Celica A. Mercury (Blazblue)Asagiri AsagiSumia (Fire Emblem)shinatsuhiko yae
(Yozakura Quartet)Gig (Soul Cradle)Birdy Cephon Altirra (Tetsuwan Birdy)Sabitsuki (.flow)Irisu Kyouko (Irisu Shoukougun!)Yuzuriha Inori
(Guilty Crown)Mizunashi Akari
(Aria)Insane Black Rock Shooter (Black Rock Shooter)Natsume (Pokemon)Tasogare Mimi (Duel Masters)