[Tomboy Princess] is an alternate form of Mary, created in collaboration with a mobile game Dragon Quest of the Stars. Her costume imitates Alena from Dragon Quest IV.

As [Tomboy Princess], she wears the same outfit as Alena, being a yellow, one-piece dress, a black belt with shield-shaped buckle, and a black, skin-tight pants. She wears a dark blue, pointed hat, a cape of the same color, a pair of green jewel earrings, and orange gloves and boots. Her hair also curls at the end, reminiscent of Alena's hair style.

As [Tomboy Princess], she wields the Fire Claws, which are also one of Alena usable weapons. In the game, the Fire Claws are considered as Dual Blades.

A rider belonged to the Central City, Laqua, who accompanies the player as a partner in their mission.

With the equipments of another world's heroes given to her by Cyril, she gains the power of Tomboy Princess, Alena.

The unprecendent tomboyness of the princess seems to have slightly effected Mary's personality, now she is even more energetic than ever.

The weapon she wielded is [Fire Claws]. A pair of clawed gloves made from metal called Mithril that emits flame in response to the wielder's Qi