Thadiun Okona was a male Human who was the captain of the freighter Erstwhile and described by Deanna Troi as a "rogue."
In 2365, he was involved as a go-between during an internal dispute of the Coalition of Madena. (TNG episode: "The Outrageous Okona")
He later encountered the USS Enterprise-D again in 2367. (TNG comic: "Wayward Son")