Aryl was an Argelian man who was a member of Starfleet in the 2370s decade. Early in the year 2374, he held the rank of ensign and served on the Federation starship USS Centaur under the command of Captain Charlie Reynolds.
More than three months into the Dominion War, Aryl was injured when three Jem'Hadar fighters attacked the Centaur. (DS9 - The Dominion War novelization: Call to Arms...)
Ensign Aryl later participated in the Centaur's mission to the Argolis Cluster and in Operation Return to take back Deep Space 9. (DS9 - The Dominion War novelization: ...Sacrifice of Angels)