"Darulio was there when you weren't." ― Kelly Grayson to Ed Mercer[source]Darulio is a Retepsian forensic archaeologist employed by the Planetary Union. Darulio slept with Kelly Grayson and was caught in the act by her husband, Ed Mercer, launching the events of the show.
Most of Darulio's background is unknown other than that he is a forensic archaeologist employed by the Planetary Union.
At some point prior in the year 2418, Darulio met Kelly Grayson, and the two began an affair that was eventually discovered by Kelly's husband, Ed.
A year later, Darulio excavates an archaeological site on the planet Lopovius, where a 30,000 year old birthing bucket is discovered. The Union orders Darulio to analyze genetic material recovered inside the bucket, which is believed to belong to the original settlers of the planet. Both Bruidian and Navarian species consider themselves the original inhabitants of the planet, and wage protracted, bloody wars for control. Darulio holds the artifact on the USS Olympia until the USS Orville rendezvouses with adequate laboratory instruments for testing.
On board the Orville, Ed and Kelly (now Captain and Commander of the Orville respectively) and Darulio exchange tense introductions, but the trio agrees to set aside their dispute to achieve peace between the Bruidians and Navarians. Darulio reveals that he has worked on field excavations on Lopovius for the past six months and did not know Ed was now Captain of the Orville. The three conclude the conversation by shaking hands.
Kelly confronts Darulio in his work station on the Orville, intending to establish professional boundaries between them. However, Kelly finds herself almost irresistibly attracted to him, and the pair have sex in her quarters.
Ed learns that Kelly is not at her post. He stumbles upon Kelly and Darulio in bed. Furious, Ed resolves to kick Darulio off the ship, but he too finds himself powerfully attracted to Darulio and changes his mind. Darulio holds several impromptu dates with Kelly and Ed, both of whom compete for Darulio's attention.
Meanwhile, Chief of Security Alara Kitan grows suspicious of Darulio. He confesses that Retepsians exude powerful pheromones while in heat that spark romantic desire upon skin-to-skin contact, and that Kelly and Ed unwittingly received his pheromones when the trio shook hands.
That night, Darulio sleeps with Mercer, but is disturbed when he realizes that their liaison jeopardized peace negotiations. With the Bruidians and Navarians at the brink of war, the Orville's crew utilize Darulio's pheromones to manufacture a drug that is secretly embedded in the Bruidian ambassador's sweat gland. The respective ambassadors are tricked into shaking the others' hand. In a matter of hours, the two decide to elope and call off hostilities. Back in the laboratory, Darulio identifies the remains recovered from the birthing bucket as both Bruidian and Navarian: the two shared a common ancestor.
After a temporary peace is achieved, Darulio returns to the Olympius. Ed catches him before boarding and asks whether he was in heat when Kelly had her affair with him. Darulio looks to Ed before giving an ambiguous answer.
Darulio is an outgoing, personable character. He converses happily with others; ostensibly respects the personal interests of Ed and Kelly; and offers to recuse himself at the command of Mercer. On the other hand, Darulio knowingly exposes the two to pheromones that alter their neurological chemistry and declines to tell them. When confronted by Alara, he shows blithe indifference for his actions: "Look, it's harmless. The worst thing that happens is we all have great sex." Although when confronted by Ed, he shows more remorse and an explanation for his actions: "I have no excuse, other than the fact that I come from a culture where it is considered rude to turn down sex."
It remains to be seen if Darulio was simply irresponsible by withholding such information, or if he truly had no care for Mercer or Grayson's well being.
Like many other aliens in The Orville, the character of Darulio called for full-body makeup. Additionally, the costume required minimal clothing: only blue underwear. Visual Effects Artist Howard Berger later recalled clearing the costume by Rob Lowe, who portrays Darulio: "Rob was like, 'What have I got to lose? I've been at this for so long, I'm in, I'm in.'" Lowe was painted blue with prosthetic scales.
- Episode 1: Old Wounds
- Episode 2: Command Performance (mentioned only)
- Episode 4: If the Stars Should Appear (mentioned only)
- Episode 9: Cupid's Dagger
- Episode 12: Mad Idolatry (mentioned only)