The vampiric son of the hero of Ooo, Finn the Human, and the vampire queen, Marceline
He/Him
Has a twin sister, Eliza https://www.weasyl.com/character/79146/eliza
Used to be inseparable with his sister, and the best of friends with the queen of the Candy Kingdom's children, but over the years they have all grown apart, and almost all of them near abhor him now, besides Queen Bubblegum's youngest daughter, Rachael, who seems to have a fairly obvious and large crush on him
Rachael is too young for Jericho, and Jericho abuses her affections for him for his own gain, such as getting her to obtain things for him
Was near killed by his sister, Eliza, when she invaded Ooo
Lives with his parents in Ooo
Sneaks off at night to assault and suck blood from unsuspecting townsfolk
He does not need blood, he just prefers it
Marceline's genes were much more powerful and assertive than Finn's, so both their kids look much more like Marceline than Finn
His sister believes him to a terror and believes he deserves to die to protect the rest of Ooo
Has an odd and terrible relationship with Queen Bubblegum's son, Theo, who he uses for blood and frequently abuses, which Theo agreed to so Jericho would leave the rest of the Candy Kingdom alone
Jericho and Theo used to be best friends, not anymore
Is not a vampire, and does not need blood, just prefers it
Can go out in the sun, his skin is just sensitive