Mai Natsume Powers

Mai's aptitude for Ars Magus is unclear, as the grimoire used for assessment short-circuited when it tried to measure her abilities. This was likely due to interference from the Nameless Grimoire. Mai however was able to use Ars Magus and she demonstrated that during Remix Heart Gaiden.

The Nameless Grimoire gave Mai a supertaster ability, allowing her tongue to obtain considerable information about what she tasted, including the thoughts of someone who made the food that she ate. This is why she was not only able to "survive" Noel's infamous death cooking, but also called it a godly dish because Noel's single-mindedness in cooking only leaves her innocence within the food. The grimoire was also responsible for Mai's change in gender as its vessel has to be female.

Mai inadvertently had a fragment of the Azure Grimoire enter her body from the Adsequi Grimoire. Due to that, Mai became the Intermediary Grimoire and her super taste evolved into an intermediary ability; she could copy someone else's abilities by tasting or kissing them and then transfer them to someone else she kissed though she was incapable of using these powers herself. In addition Mai demonstrated enhanced physical abilities when in dangerous situations, the ability to release a burst of energy that destroyed a monster created by Seifer, the ability to sense the location of Chachakaka during combat even with her eyes closed and she was able to bring down an alchemical barrier that was about to crush her. Mai ceased being the Intermediary Grimoire and lost these abilities when Seifer extracted the Azure fragment from her.

Variable Heart revealed that, after the incident with Seifer at the end of Remix Heart, Mai's body transformed into The Blank Grimoire, an empty grimoire that can utilize whatever power gets inscribed within it. Mai also demonstrated increased resilience as a result of her transformation, being able to remain conscious after receiving a blow powerful enough to incapacitate a normal human, and she lost her supertaste ability. Furthermore, right after her battle with Seifer, Mai was shown to be regenerating her injuries while she was unconscious. By the time of Centralfition Mai continued to be The Blank Grimoire, however her supertaste ability had returned and not even Kokonoe had been able to cure it.

According to Kajun, Mai has the second best physical abilities among Team Remix Heart following Makoto. Mai remarked that she had trained in martial arts since childhood, while Shiori observed that Mai knows and can use the Kirihito family's assassination techniques. However her favorite fighting style during Remix Heart involved using a longsword in her right hand and a main gauche in her left. Mai obtained a powerful spear called Outseal that is a Legacy Weapon replica in Variable Heart and started using it as her preferred weapon from then on, continuing to do so in Centralfiction.