Minaho Masaki is the eldest daughter of Yosho Masaki (Katsuhito) and Airi Masaki. Born amid political chaos on planet Airai, her mother's arranged marriage collapsed due to societal breakdown triggered by forces like the Widow. Airi and Minaho survived under the protection of Keira Magma, Airi's great aunt, before securing asylum at the Galaxy Academy. Persistent assassination attempts by Airaian religious adherents ultimately compelled Jurai to formally recognize Minaho as Yosho's daughter, granting her the protective Masaki surname. Scientific experiments conducted by Airi on Minaho during her Galaxy Academy studies left permanent scars on her back. Though removable, Minaho retains them as marks of pride. Her isolated and perilous upbringing contributed to prolonged arrested development. She later spent roughly a century on Earth working fields near the Masaki Shrine, simultaneously helping raise her younger sister Kiyone while Airi pursued her career. Minaho laments the mere 19-year age gap with Airi, feeling more like a sister than a daughter due to their centuries-long lifespans. Professionally, Minaho serves as the chief intelligence officer for Lady Seto Kamiki Jurai, commander of the Juraian fleet. Her role involves monitoring galactic affairs and political ramifications. This duty earned her nicknames such as "Seto's Leash" or "Seto's Conscience" for her unique capacity to moderate Seto's actions. She leads a team including Mizune Masaki, Otoka Masaki, and Fuuka Masaki, handling background operations concerning political disruptions caused by individuals like Seina Yamada. Minaho reports on major incidents like the Choubimaru affair and attends family events including Kiyone's wake and Nobuyuki Masaki's wedding. Over 700 years old, likely due to bonding with a Juraian Royal Tree, Minaho exhibits professionalism but voices occasional regret over her close association with Seto. Her personality is often compared to Funaho Jurai, contrasting with Airi or Misaki's eccentricities. She demonstrates expertise in aikido, notably during Kenshi Masaki's training. Within her family, Minaho reconnects with her nephew Tenchi Masaki during preparations for Nobuyuki and Rea's wedding. Bonding over shared agricultural work, she reveals her prior century on Earth and discusses Kiyone's joyful memories of Tenchi. Minaho expresses regret over missing much of Tenchi's childhood due to galactic duties, positioning herself as a maternal figure while acknowledging Rea's complex role as both stepmother and Tenchi's former crush. A recurring theme involves marital status jokes, with figures like Emperor Azusa suggesting suitors such as Seina Yamada. Light novels indicate Minaho's declared intent to marry Seina for political reasons, aligning with her team potentially forming another "Four Future Wives" group for him. However, OVA episodes depict ongoing teasing about her unmarried status during Tenchi's engagement announcement, creating ambiguity regarding novel continuity. Minaho participated in critical events, such as severing Kiriko Masaki's parasite-infected arm during a space pirate attack on Earth, saving her life. Her actions reflect a blend of duty and familial loyalty, navigating Juraian politics while supporting the extended Masaki network. Her background includes unresolved elements like a non-canon fetal stasis story and contradictions concerning her birth timeline relative to Ryoko's attack on Jurai. Minaho's development emphasizes reconciliation with her past, commitment to galactic stability, and integration into Tenchi's life as a stabilizing influence.