Diabolus D. Devil is a devil who helped Dhiar during the events of 'I for Incubus'. He has a striking appearance that seems to be similar to the stereotypical image of a 'devil', such as deep red skin, solid black eyes, and a spaded tail.
Diabolus joined Dhiar in Phantasies after the defeat of the villains and quickly became close to Lanimaz.
He is still unsure he understands garish holiday sweaters.
- Diabolus possesses strength far greater than an average human.
- He also has a number of abilities inherent to his kind, such as superior resilience and enhanced senses and reflexes, as well as various others.