In the original Spyro the Dragon, Spyro's belly is yellow.
Spyro is designed as a young purple dragon with a bright yellow underside, yellow horns, and red wings. The contrasting palette makes his silhouette easy to recognize against the colorful landscapes of the original PlayStation game, released in 1998.
His coloring also reflects an important piece of development history. Spyro was originally conceived as a green character, but the designers changed him to purple so he would stand out more clearly from grassy environments. His yellow belly remained a distinctive accent across the original trilogy and later appearances.
Players sometimes confuse Spyro's belly with orange because of warm lighting, low-resolution textures, or later visual styles. Green is also a development-stage association rather than his final appearance. Spyro's signature body color is purple, while his belly is conventionally identified as yellow.