A high-definition 3D model of a chibi-style astronaut character with a clean white spacesuit, bulky proportions, and cute rounded shapes. The design should have a cartoonish and stylized look, similar to game mascots. The helmet is glossy white with clear glass, showing a friendly, expressive green zombie face with large eyes and a goofy smile. The spacesuit should have orange accent lines, small buttons, and panels with subtle wear and shading for realism. Use HD PBR textures, smooth topology, and matte finish lighting. Environment lighting: soft studio light with subtle shadows. Style tags: 3D, chibi, astronaut, stylized, zombie, cartoon, HD detail, matte, clean white suit, game-ready model.