Rio Kujou

She is an invective person who was always quarreling with Miyokata Nonako. Her real name is Rio Kujou.

Rionetta's magic allows her to manipulate any dolls within her line of sight. After applying her magic, the effect lasts even if the doll is out of her sight.

(Source: Mahou Shoujo Ikusei Keikaku Wikia)