
Quick answer — Yuki Takao voices Alka in Blade & Soul, Maria Sarushima in Yamada and the Seven Witches, Azusa in Hamatora and 1 more characters.
Yuki Takao voices Alka (Blade & Soul), Maria Sarushima (Yamada and the Seven Witches), Azusa (Hamatora), Nanami Kanzaki (Kimi no Iru Machi: Tasogare Kousaten).
Alka is voiced in Japanese by Yuki Takao.