Orson (Japanese: オーソン Oson) first appeared in Pac-Man World. He only directly appeared at the end, after Pac-Man defeated his Toc-Man robot. Orson was once eaten by Pac-Man, after he claims "Nobody loves a ghost." He returns in Pac-Man World 3 as a friend of Pac-Man. He is the one who tells Pac-Man about Erwin's evil plot. He also rebuilt Toc-Man for Pac-Man to try out.
Orson always had a love for science, but he became jealous of Pac-Man because of his popularity. Orson wanted Pac-Man to be forgotten so he himself can become more popular than Pac-Man. Orson's life back then, however, was very different then the party life he lives in current times.
Orson constructed Toc-Man sometime around his early twenties, the same age as Pac-Man. Orson planned that Toc-Man would work for him and help him overthrow Pac-Man. Orson taught Toc-Man to serve him and obey him. Nevertheless, Toc-Man enjoyed partying rather than chase after Pac-Man until Pac-Man appeared in Ghost Island. Though Pac-Man was invading and Toc-Man didn't know well of what to do, as he never listened to Orson.
Pac-Man World 3
Pac-Man defeated Toc-Man and Orson noticed his strength. Pac-Man would sometimes work for Orson in a capacity similar to an agent. Orson would assign Pac-Man missions in Pac-Man World 3. Once the objectives started getting rough, Orson would allow Pac-Man to utilize his old Toc-Man machine, thus the missions became easier and Pac-Man was able to defeat Erwin and the rest of the famed ghosts.