Rinne is half-human, half-shinigami, and chooses to live in an abandoned school building rather than take up his grandmother's offer to stay with her. His grandfather used to support him before passing away, which is when Rinne took on shinigami duties full-time.
What's notable about Rinne is how he does the job on a shoestring budget. While actual shinigami have expensive gear built into their nature, Rinne relies on cheap tools—usually costing around ¥500 to ¥1,000—to get his work done. The one exception is his Haori of the Underworld, an expensive robe that serves two crucial functions: it lets him move through the human world invisible to living people, and when flipped inside-out, it solidifies ghosts so they can be properly dealt with.
Being perpetually broke, Rinne has zero qualms about scooping up money, snacks, or offerings that students leave around school. He's notorious for refusing to pay for anything he can avoid—rent, uniforms, basic necessities—treating financial responsibility as more of a suggestion than a rule.
His name actually carries real meaning: "Rinne" refers to the Buddhist concept of the cycle of rebirth, while "Rokudo" references the six paths that make up that cycle. So his name is basically built into the whole spiritual framework he operates in.
Content compiled by AnimeList.moe from publicly available sources.