Mize

Background
Mize is of the Ash-Mouse Tribe that resides outside of Earl Seryuu's territory.

Appearance
Satou describes Mize as though he has a rat's face it's 'nihilistically handsome.'

No-Life King Zen
As Mize leads his ratmen cavalry--that ride on the Hexapedal boar (Dash Boar)--whilst being pursued by flying ants on the orders of Zen. He makes contact with Satou's carriage and forcefully urges Satou to protect their princess (who would later be revealed to be Mia), tossing her to him before making a last stand so the carriage escapes, dying honorably in the process.

It is revealed by Mia to Satou how she became acquainted to Mize due to him being saved by Mia's parents (Lia and Laya) when he was dying and surrounded by goblins outside Boruenan Forest ten years prior to Satou saving her. Mize then stayed in Mia's parent house for a while while being taught together with Mia various things by them.

Trivia

 * It seems that Mize's red helmet is a mithril product given to him by Mia's parent.