Immortal

Very nice! I've always theorized how since Cthulhu is the son of Yog Sothoth, who literally has the ability to retcon death (and even alter peoples' memories to the point they can forget someone died or lived) and is known to impregnate human women with his offspring at cults(such as in Dunwich Horror), given the bizarre circumstances that happen whenever Kenny dies and his immortality, it's possible that Yoggy himself is the father which would make Cthulhu technically Kenny's half-brother.

It'd actually make sense as Kenny shares some similarities to Wilbur Wheatley, a character from the Cthulhu mythos who was the result of an ancient one impregnating a human woman, and gestated and matured very quickly in a short amount of time after birth, and also covers nearly his entire body(albeit for different reasons as Wilbur's way less human-looking below the chest), and his parents being connected to a cult associated with the Lovecraftian horrors, though that may all be coincidence.