Along with the basic Chao, there are many different types of Chao. They are categorized by alignment, stats, and appearance. Keep in mind that each category of Chao can overlap, which means that you can have a Blue Hero Running Chao or a Gold Neutral Power Chao. When a Chao , it will become either a Hero, Neutral, or Dark Chao depending on how it is treated by which characters. Hero and Dark Chao are absent from Sonic Adventure. (For the Dreamcast)