Grendel is Ian's Omnitrix's DNA sample of the Ghoulius species.
Grendel is an off-white wisp-like ghost with an animal-like head and his left solid white eye missing. He is 5'10" and wears the omnitrix on his chest.
Grendel is rather quiet most of the time and speaks through murmurs and whispers, and very rarely will shriek. He cares deeply about books, especially older ones.
- Intangibility: Grendel can turn intangible at will.
- Object Possession: Grendel is able to possess and control objects, similar to a poltergeist.
- Invisibility: Grendel is able to turn invisible at will.
- Levitation: Grendel can levitate.
Grendel's weaknesses are currently unknown.
Grendel is named after the beast from the book Beowulf.
- Grendel was named by Ian's best friend on Instagram.