Osonu was a lieutenant in the Galactic Republic forces during the third Galactic War. This Human female was a grappler specialist around 3626 BBY.
Osonu is featured as a boss character in the video game Star Wars: The Old Republic within the Onslaught expansion pack. She is exclusive to the Imperial narrative; in the Republic version, her position as a grappler is taken by Dogah.
Within the Imperial storyline, Osonu, alongside fellow Republic soldiers Meinar and Corrik, engages in combat with the Commander, Darth Krovos, and Darth Rivix. This confrontation occurs when the Sith group arrives at the Dantooine Jedi Enclave while searching for Darth Malgus. Ultimately, Osonu and her comrades are defeated and killed by the Commander's team.