Shaorin
She wears Traditional styled costumes, has little understanding of the human world after spending a few thousand years in confines of the ring. Throughout the anime her purpose is to protect Tasuke and she does so by summoning different assistants called hoshigami (literally "star gods") through the ring.
Tasuke Shichiri
A high school student, son of a globe trotting archeologist father. Because his father travels and his mother is deceased he lives alone in his two story home at the beginning of the story. He is decisive and intelligent, but nonetheless beleaguered.
Keikounitten Ruuan
She is freed from a wand artifact, the kokutentou, by Tasuke.Ruuan's role as opposed to Shaorin's is not to protect Tasuke but instead make him happy which she does by giving inanimate objects life to do her bidding. Ruuan and Shao are sworn rivals and conflict occurs often as their roles of keeping Tasuke "safe" or "happy" aren't always equivalent.
Rishu
The tiny, pink-haired, telepathic hoshigami of Shaorin is given to Tasuke when he attends school. She is unable to speak at an audible volume to Tasuke so she communicates by drawing cartoons on palm cards with a paintbrush. She has a cute way of speaking. She says "deshi" instead of "desu" and calls Tasuke "Tasuke-shama".