Manya Atachi is a child actress and Yuamu Ohdo's childhood friend. Her acting talent allows her to fully inhabit roles, such as convincingly portraying a spoiled, entitled personality during interactions with Yuamu, temporarily misleading her about Manya's true self. Off-stage, Manya displays an inherently kind and sweet nature, creating a sharp contrast with her performed personas.

During a Rush Duel against Yuamu, Manya subtly incorporated lines from her past characters into the match, hinting at her acting role and revealing the performative intent behind her behavior. Separately, she created instructional Rush Duel content, including training videos. These videos gained attention and led Yudias Velgear to become a fan after viewing them.