 Kaidoh trains rigorously, increasing the training program given to him by Inui to give him an abnormally high stamina, even against other characters who boast to have high stamina.He has a deep rivalry with Momoshiro, in which they constantly try to beat each other.Because they are rivals, they also know each other the best, and they can get along very well in times of need; this makes them an efficient doubles pair.