Tom Lucitor is the demon prince of the Underworld and Star Butterfly's boyfriend in the Disney XD animated series, Star vs. the Forces of Evil.
Tom is considerably short-tempered. When he gets angry, Tom's eyes glow bright red, and sometimes speaks in a low-pitched demonic voice. He has a very controlling personality, wanting things to go exactly the way he wants them; anything that deviates from his plans can set off his temper, even small things like Star not wanting to wear a spider on her head. When not enraged, Tom can be rather easygoing, as he understands that Star might not want to go to the ball in "Blood Moon Ball" and is later willing to listen to Marco in "Mr. Candle Cares". In addition, he makes a genuine effort to overcome his anger issues in "Friendenemies", and he can be generous and compromising.
Over time, Tom has grown to be an extremely understanding and respectful prince, determined to be a better person to his friends and subjects. He behaves gentlemanly and polite toward his fellow royals at the Silver Bell Ball in "Club Snubbed", and does his best to give Star her space. In "Demoncism", he tries to rid himself of his inner demons. These developments help Tom reconcile his relationship with Star again. Although Tom still has problems with his temper, as he becomes annoyed at Star choosing to keep watch over the Mewman/monster gathering rather than spend time with him.
- In a storyboard test, Tom originally had a different design, including a different hairstyle and horns.
- Also, Tom was even more short-tempered and prone to angry, childish tantrums. He was also petty and disproportionately vengeful, threatening to unleash hordes of demons and monsters upon the Earth just because Star refuses to go with him to Demon Prom.
- His name is likely a reference to "The Devil and Tom Walker", Washington Irving's adaptation of the story of Faust.
- Tom's last name, Lucitor, is possibly based on Lucifer, a Biblical fallen angel and Devil of the Abrahamic religions.