He is a short young man with blond hair (in a chin-length bob cut) and green eyes.
Switzerland is seemingly eternally neutral and lives his life as a hermit/recluse, surrounded by the Alps. Though he appears to be peaceful, he actually is the biggest producer of guns in the world and has the most military strength. He hates outsiders and in the past, was hired by the Vatican as a mercenary. He's also very frugal, buying cheap cheese rather than expensive and claiming he likes the taste of it better. He once went to lunch with Austria just to save money. He's shown to have quite a temper, but has a soft spot for Liechtenstein and is extremely protective of her.
Due to Italy's habits of forgetting his pants and streaking, Switzerland becomes trigger-happy if he catches him running through his property.