Unnbjörg Signar (ユンビョルク・シグナル, Yunbyoruku Shigunaru) Voiced by: Ryo Hirohashi Unnbjörg, nicknamed Yuna (ユナ) for short, is one of Lotte and Asuha's friends. She has short green hair and a tall, slim figure. Unnbjörg is generally the most level-headed one of Lotte's friends, although she tends to go berserk whenever someone comments on her flat chest.