New Death is the son of the Cosmic Entities Death and Life, and the former ruler of the Land of the Dead and the Dead Worlds, after Death. He appears in "Together Again", initially serving as the episode's main antagonist until it was revealed he was manipulated by the Lich into usurping Death, and tried to stop reincarnation as part of the Lich's quest to end all life.
Before becoming the new ruler of the Land of the Dead and the Dead Worlds, he had a rattlesnake-like head and four eyes, alongside dark cyan scales. He wore a ripped shirt, blue jeans torn at the knees, and two black boots. After he killed Death, he lost the skin on his head, and gained Death's hat. Additionally, his arms became masses of coiled serpents, the ends of which he covered with black gloves (with the one on his right likely covering the Lich).
He's your typical moody teenager taken to an extreme, he's selfish, careless, and rules the Land of the Dead with an iron fist, and is served by a team of winged minions called Undertakers, which formerly included Tiffany Oiler before he was adopted by Joshua. New Death has no problem killing any of his lackeys for minor mistakes such as letting Finn come to his domain, and he didn't even worry about the fact that Finn and Jake were going to kill him, more focused on the fact that if one of them killed him, they would become the replacement for New Death, and started laughing - though this may have simply been the Lich starting to completely control him.
Death is New Death's father. New Death didn't have a great relationship with his father, always being impatient and less calm compared to Death, he also doesn't seem to care that he killed his own dad, being more worried about what his mom would do if she found out.
Life is New Death's mother. It is unknown if New Death has ever been in close contact with his mother, but it is hinted at that neither shared a close bond. Life being busy all the time reincarnating entities and distracting her from taking care or forming a bond with New Death likely lead to neglect. This might explain why his personality isn't comparable to his father.
New Death doesn't seem to have any friendship between any of his minions, as he frequently kills them or threatens to kill them if they fail him in any way.
New Death considers the Lich to be his "best friend", either unaware or unconcerned with his malicious intentions, saying he has a "cool vibe". Taking advantage of their tense relationship, the Lich goaded New Death into killing his father, after which the Lich possessed his right hand. After being exposed by Finn, the Lich fully took control of New Death until his demise thanks to Mr. Fox.
- New Death is the only known Cosmic Entity to be created via birth from two other Cosmic Entities.