Rei is a singer in the pop music group CHAM! After Mima left, Rei and Yukiko become more popular, which results of them getting into the best singing group charts. She does seem to care about Mima, even when she changed careers. In one scene in the film, Rei and Yukiko are on their radio talk show and when they bid goodbye to the audience, Mima's apparition appears. Although Rei is happy to see Mima, but is shocked when Mima suddenly leaves and goes after the apparition. (Source: Satoshi Kon Wikia)
Producer of Mima Kirigoe. It was his idea to promote Mima as an actress, but Hidaka Rumi didn't support him on that.
He was supposed to be the final victim of Me-mania, however he failed and both Tadokoro and Me-mania were killed by the real culprit.
Jiro is the owner of the shadow Minotaur, who uses white magic in the game. In the anime, Minotaur is always chiding Jiro for overusing his energy in battle but generally takes a calm approach to opponents. from wikipedia
Bouquet's shadow is Hippopotamus. Hippopotamus may be weak and somewhat cowardly, but he has the ability to shapeshift, sometimes using that ability by wrapping around Bouquet to provide her with a disguise. Hippopotamus later gains the ability to copy the attacks that he is hit by. In the second series, he and Bouquet have been given the ability to merge with Blue Dragon or Saber Tiger to provide armor and make them appear in near-full form. He also worries for Bouquet's well being whenever a battle begins. from wikipedia
A Beautiful girl with a shadow hidden somewhere. She is popular with the boys, though because of that girls are jealous and loathe her. She absolutely hates men due to a certain incident in the past. She has feelings for Ayumu that go beyond friendship.
Jessie is a 15 year old girl who has a special type of blood that heals every illness. She was trained ever since she was a little girl at the caravan. She heads to her district to start her work as a docter. She falls in love with Eagle-san more into the story. She also saved his life by giving him, her blood.