Despite his youthful appearance, Blanc's housemate has a tongue as sharp as his wit. Also called "Mad Hatter", he runs a hat shop while taking side jobs in weapon customization, satisfying his inventive side. Although his words and actions may put some adults to shame, this kid's situation is much stickier than it seems.

Oliver has large, grey eyes, and dark brown hair which extends just past his shirt collar. His long bangs cover his left eye partially