
Quick answer — Yuka Takakura voices Touta Konoe in UQ Holder!, Yuuyan in Erin, Mayo Mayuzumi in Level E and 3 more characters.
Yuka Takakura voices Touta Konoe (UQ Holder!), Yuuyan (Erin), Mayo Mayuzumi (Level E), Mai Maimaki (Hentai Prince & the Stony Cat), Ooshima (Urara Meirocho), Momo Tanabe (Blue Reflection Ray).
Touta Konoe is voiced in Japanese by Yuka Takakura.