Tamaki Kotatsu is a former Third Generation Second Class Fire Soldier previously in Special Fire Force Company 1. Due to her service for Rekka Hoshimiya, she was disciplined under Special Fire Force Company 8’s watch.

Tamaki is a young girl of average height with long, straight dark hair tied into twintails, golden eyes with white pupils similar to Shinra, and a curvy body. On missions, her outfit consists of black panties and bra, a protective outer jacket, a neck protector, dark boots and protective gloves. Parts of her outfit are coated with blue lines. Tamaki’s torso is open, revealing her entire stomach area and cleavage. Her trousers are also exposed at the buttocks. The sleeves of her jacket appear to be too long for the arms and the buttons are in the shape of cross-like symbols. Her outfits previously contained patches with “1” on it, to signify Tamaki’s affiliation to the 1st Special Fire Brigade.