Arnold

Arnold is Reimi Sugimoto's loyal guard dog in Diamond is Unbreakable. He was killed by Yoshikage Kira and remains as a ghost alongside Reimi in a ghost alley. Arnold's loyalty is shown when he defends Reimi from Kira's attack, ultimately leading to Kira's demise. After Kira's defeat, Arnold and Reimi ascend to Heaven, finally finding peace.