She is a shaman and voodoo doll user who works under Manta's father, Mansumi, alongside Reiheit.
Not much is revealed about her past.
Amano Teruko is created by Hiroyuki Takei; she has no information regarding any inspiration used to create her. She is a manga only character who first appears in Shaman King volume 30: chapter 262.
Amano and Reiheit first appears on Mansumi's warship. On the day of battle between the shamans and Mansumi's men, Hao destroys the warships with little effort. Reiheit shoots at Hao with his Angel, Azazel, but he fails and dies as his Over Soul collapses. Amano attempts to take revenge by hammering a voodoo doll that has Hao's hair. However, she hammers herself to death because the doll has her hair.
She wakes confused on the beach, nude, next to a campfire. Reiheit explains that he is drying her clothes; he sweet talks her about how life is more than fighting and proposes to marry her. Amano accepts; the couple make love off screen.