Izumi Todo (東堂いづみ Tōdō Izumi), who is credited with creating series like Ojamajo Doremi and Futari wa Pretty Cure, is a collective pseudonym for the staff at Toei Animation. A similar pseudonym is Hajime Yatate from Sunrise.
The name comes from "Tōei Dōga (the old name of Toei Animation), Ōizumi Studio" (written in Japanese as 東映動画大泉スタジオ).