Niles was a male Human and member of the Maquis.
In 2370, he was a member of the Maquis cell commanded by Calvin Hudson, a former Starfleet commander who became part of the Maquis. Wearing a Starfleet uniform, he was part of the Maquis team that captured Gul Dukat on Deep Space 9. With Sakonna, they subdued the guard posted at his quarters and led him under false pretenses to an airlock, and stunned him when he realized the plan and fled. He accompanied the team on a freighter to an asteroid in the Badlands where they waited for Commander Benjamin Sisko in pursuit. He left with Hudson after Sisko and team were stunned.
He also took part in a Maquis raid on a weapons depot on Bryma which failed when his and Hudson's Federation attack fighters were disabled by Sisko and crew. (DS9: "The Maquis, Part I", "The Maquis, Part II")