She was Setzer Gabbiani's girlfriend and owned the Falcon, an advanced airship model. Attempting to test the ship's limits in an experimental flight, she asked Setzer to take care of it if the worst should happen to her.
Setzer jokingly challenged her to an airship race around the world in his Blackjack in order to keep an eye on her. Seeing that he could not keep up, he let Darill proceed with her flight, asking her to be back by sunset at their favorite meeting spot. Darill never returned, and a year later, Setzer found the remains of the Falcon crashed in a distant valley. He managed to recover the wreckage, repaired the airship and laid it and Darill to rest inside a tomb near Kohlingen.
- In the Dawn of Souls, 20th Anniversary and iOS remakes of the original Final Fantasy, Daryl is one of the automatic names the player can choose for the Thief job.
- Darill may have been inspired by the real-life pilot Amelia Earhart, a female pilot who set piloting-records in her time and mysteriously disappeared in an attempt to make a circumnavigational flight of the globe in 1937.