What type of character is Arthur, played by Michael Sheen in 'Passengers (2016)'?

Passengers is a 2016 American science-fiction romance film directed by Morten Tyldum and written by Jon Spaihts. It stars Jennifer Lawrence and Chris Pratt, with Laurence Fishburne and Michael Sheen in supporting roles. It follows two passengers on an immense interstellar spacecraft.

The Avalon, a sleeper ship transporting 5,000 colonists and 258 crew members in hibernation pods, is traveling from Earth to the planet Homestead II, a 120-year journey. After only 30 years, an asteroid collision damages the ship despite its defense systems, causing a malfunction that awakens mechanical engineer James "Jim" Preston 90 years too early.

After a year of isolation, with only an android barman named Arthur (Michael Sheen) for company, Jim grows despondent and contemplates suicide until he notices Aurora Lane, a beautiful young woman inside her pod.