Played by: uncredited infant actor
Full name: Kirayoshi O'Brien
Species: Human (Irish/Japanese descent)
Birthplace or childhood home: DS9
Parents: Miles O'Brien (father); Keiko O'Brien (mother)
Sibling: Molly (older sister)
The O'Briens' second child, a boy; called Yoshi for short. He was born in 2373, with Kira acting as surrogate mother (because Keiko had been injured and was unable to carry him to term). Kirayoshi's name was first mentioned in "In Purgatory's Shadow".
Appearances: "The Begotten" (when he was born), "Business As Usual", "Ties of Blood and Water", "Time's Orphan", "What You Leave Behind"