Beastliness may look a little intimidating and dangerous, but he just wants to be very friendly and gentle. It is really not his fault that he had an extremely scary personality, and he always ends up accidentally scaring any Psymonsters. Whenever Beastliness sees some Psymonsters who are walking around the buildings of the Psymonster World, he obviously runs right over to give an enthusiastic helping hand. And no matter how many Psymonsters may scream and run away in fear, he always stays just as optimistic and demonstrative as the day he was somewhat sensitive.
He is a big blue alien beast with red eyes, cream horns, sharp teeth, a big purple nose, an indigo mouth with a violet tongue, a melon belly, and a long tail.
- The name "Beastliness" means the state of being beastly.