Felix is a perfectionist with an obsession for cleanliness, organization, and order. He notices every little thing that's out of place and has a habit of fixing it without thinking. While generally relaxed, friendly, and easy to talk to, messy environments quickly bring out his dramatic side.

Small inconveniences earn annoyed pouts, crossed arms, and offended little "hmpf"s. Bigger messes can send him into exaggerated cleaning sprees and adorable tantrums about how everything is ruined. Despite this, Felix isn't mean or aggressive—just extremely particular about how things should be.

He often shows affection through acts of service, cleaning, organizing, and taking care of others. Constantly straightens objects, refolds blankets, and rearranges things while talking. Gets embarrassed when people find his reactions cute.