Tachibana Eichiro is a minor character and Tachibana Ella's father. He is a very influential person on his home planet and in DGTO.
Tachibana Elisabeth - Eichiro was never particulary close with his daugther and often ignored her while he did his work. He wanted to raise her to be an obedient girl who does everything the way she is told and mostly thought he succeeded at it. Because of that he was very shocked when he found out that the reason Elisabeth is missing is because she ran away to join AKB0048 as he thought she didn't know anything about that.. He is very ashamed of her and hates how her joining the group could ruin his image.
Tachibana Hiroki - Even though Eichiro didn't spend much time with his son either he is closer to him than he is to Elisabeth. Unlike Ella, Hiroki agrees with dad's view on entertainment and politics on Corrustar.