Sako is one of the main villains of the anime series Upotte!!. She is a transfer student from Finland with elf-like ears and a rather vicious control freak who becomes determined to defeat Funco's friend Ichiroku in the mock battle. She is the personification the Finnish SAKO Rk 95 Tp assault rifle. After the mock battle, she eventually takes a liking to Funco and even kisses her before she leaves the school. She is voiced by Madoka Yamanaka in Japanese and Maggie Flecknoe in English.