Chinese quince make great bonsai. They take 4-5 years usually before they begin to fruit. I’ve seen their little purple flowers within a few years from seed.
These grew fantastic here in maryland. Most I cut back mid summer after they reached 18-24 inches tall to allow the smaller around them to get larger.
7-12 inches tall. Trunks will vary in thickness, some are very thick even after a single season (pencil thick wide)