Saeko Iijima

Member of Aizawa's second trio group (the other one is the defunct Miyabi Aizawa-Urumi Kanzaki-Tomoko Nomura combo). Along with Chikako Shirai, become Onizuka-clan member in 13th volume, after listening to Kikuchi's advice. http://www.miyabiaizawa.com/characters/character_index.php