In 2007, Elliott mistook the mundane-turned-rat Simon for his friend Zeke and took him to the Hotel Dumort. When the Shadowhunters arrived to take Simon back, Lily told him to hold onto the rat until the rescue party promised to take their deal. When Elliott tightened his grip around Simon, the latter bit him, much to his annoyance. Simon the rat was later snatched from his hand by Clary.
Some time after, he went to Taki's Diner with Lily and Raphael. On the same night, the warlock Magnus Bane was on a date with the Shadowhunter Alec Lightwood. When he found out who Alec was from his friend and interim leader Raphael Santiago, Elliott teased the Shadowhunter, asking him what his parents would think of him dating a warlock. Annoyed, Magnus told him not to spread rumors about them, subtly threatening him with magic. Neither of them willing to stand down, Elliott and Magnus silently challenged each other through looks before they were interrupted by Raphael, who assured Magnus that they would tell no one, though he eventually told Ragnor Fell.
After the Mortal War, Elliott attended Malcolm Fade's celebratory party in Venice with Lily and Raphael. During the party, he tried to drink many different forms of Downworlder blood (including a selkie's and a mermaid's) and wound up puking blue and green in a large aquarium. Later on he was found on the dance floor dancing with Magnus and many others when Barnabas Hale interrupted the party and caused the building to come crashing down. Elliott then assisted Alec in helping people escape by catching them as Alec had them jump out of a window. When everyone was safe, they discovered the body of Mori Shu, in which someone had attempted to make it look as though a vampire had killed him. Raphael immediately ordered they leave though Elliott had still hoped to go to the after-party.
In 2010, Elliott bit a mundane whom Mordecai fed faerie fruit, and his clan leader Lily Chen saw him and stopped him before he could kill the man. Because of the effect of the fruit on his mind, he performed the Dance of the Twenty-Eight Veils (possibly a variation of the Dance of the Seven Veils) in Times Square, embarrassing Lily. Alec Lightwood believed that Elliott drank the intoxicated mundane's blood on purpose — as it had been his seventeenth incident with faerie fruit — and told Lily to keep him away from the park.
In 2012, he was left in charge of the New York Vampire Clan when Lily went with Alec to Buenos Aires to go to the Shadow Market. When Alec was there requesting for Lily's help, it was discovered that the previous night Elliott had caused a disaster at the Hotel Dumort by breaking one of the walls — he was having an affair with two different selkies who found out about each other when one of them found the other's sealskin in the wardrobe, causing a scene to happen. He then proposed to Bat Velasquez (who was there DJ-ing) that he, Bat, and Maia Roberts should all be in a relationship (or have a threesome) with one another. Bat rejected his offer claiming that his abuela wouldn't like him but that she loves Maia.
Elliott is a thin black boy with dreadlocks.
He is quite irresponsible and enjoys to have fun all the time without really thinking about anything else. Lily usually puts him in charge of the Hotel when she's gone mainly as a strategy because he is so chaotic that when she returns, all the vampires are eager to listen to her again.
- City of Bones (first appearance)
- What to Buy the Shadowhunter Who Has Everything
- The Red Scrolls of Magic
- Born to Endless Night (mentioned only)
- The Land I Lost
- Queen of Air and Darkness
- Forever Fallen (mentioned only)
- Elliott is bisexual or pan-sexual and his love of threesomes suggests that he is also poly-amorous.