Sasami Masaki Jurai, younger sister of Ayeka, is a princess of the planet Jurai, born to Emperor Azusa Masaki Jurai and Empress Misaki Masaki Jurai. Her lineage includes her half-brother Yosho and her grandmother Seto Kamiki Jurai, the "Devil Princess of Jurai." Approximately 700 years ago, during a space pirate Ryoko's attack on Jurai, the three-year-old Sasami suffered a fatal fall in the Royal Arboretum. To save her, the Chousin goddess Tsunami—progenitor of Jurai's Royal Trees—assimilated with Sasami. Tsunami-no-ki reconstructed Sasami's body and merged their spirits, resulting in one being with two souls destined to fully merge as Sasami matures. Sasami kept this secret for centuries, fearing rejection, but her family ultimately accepted her. Sasami possesses the appearance of a pre-adolescent girl with teal hair often in long pigtails, pink eyes, and an upside-down triangle birthmark on her forehead marking her Juraian royal status. Despite being over 700 years old, she was approximately eight when she stowed away on her sister Ayeka's ship, Ryu-Oh, to search for Yosho. Suspended animation during the journey preserved her physical and mental age at eight upon reaching Earth. Her Juraian heritage and Tsunami connection grant an extended lifespan; she ages slowly until maturity, then remains in her prime for centuries. Her personality blends sweetness, responsibility, and occasional mischief. She acts as a maternal figure in the Masaki household, managing cooking and domestic duties with exceptional skill. Generally mature and selfless, she also enjoys practical jokes, like tricking Tenchi into stealing Ayeka's possessions. Her demeanor varies: more composed in the OVA series, more volatile in *Tenchi in Tokyo*, and more lighthearted in *Tenchi Universe*. She shares a strong bond with the cabbit Ryo-Ohki and refers to the other women in Tenchi's life as "sisters." Her abilities stem from her fusion with Tsunami and Juraian enhancements. She commands Tsunami-fune, the most powerful ship in the Juraian fleet, summonable from subspace at will. Her link to Tsunami lets her sense the status and location of all Juraian treeships. She possesses precognitive abilities, though they manifest as distressing nightmares. Trained by her mother—Supreme Commander of the Juraian Royal Bodyguard—Sasami is a formidable combatant capable of defeating trained Galaxy Police officers. One hair accessory transforms into a battle staff, and Tenchi acknowledges her superior combat skill during their spars. Across continuities, Sasami's role and background differ significantly. In *Tenchi Universe*, she lacks the Tsunami connection, possesses no special powers, and her personal ship is destroyed early, stranding her on Earth. She is an expert video game player and mentors the android Azaka. The *Tenchi Muyo! in Love 2* manga companion presents a potential future where Sasami and Tenchi have a daughter, Izumi, though Sasami's narration clarifies this is only one possible outcome dependent on choices made. In non-canonical spinoffs like *Pretty Sammy* (OVAs and TV series) and *Sasami: Mahou Shoujo Club*, she is reimagined as an ordinary girl—Sasami Kawai or Sasami Iwakura—who gains magical powers from Tsunami to transform into the magical girl Pretty Sammy, parodying the genre. As Sasami matures, her appearance evolves to resemble Tsunami's adult form, including adopting Tsunami's hairstyle. Even after fully merging with Tsunami, she continues her domestic responsibilities within the Masaki household.