Sebastian has been living in San Fransokyo for six years when he left his home in Illinois. When he went to high school he met Tadashi Hamada, Go Go Tomago, Frederick Frederickson, Wasabi, and Honey Lemon. They all became good friends to one another and when they all went to SFIT, Go Go, and Sebastian lives in a apartment with each other but separate rooms in a sketchy neighborhood. When he lived there with Go Go they became really close to one another and start to develop feelings to each other as well but they didn't want to brake their friendship by telling there feelings to each other so they stayed friends for now.