This Japanese general should be romanized as Tachibana Koichirō from 立花小一郎. I also noticed that Andō Teibi's ō is romanized as a simple o, so either it should be Koichiro (same sound as in Andō

or also Koichirou in engine terms. I haven't looked closely at the other Japanese leaders yet, but will see if I find any other inconsistencies.