Despite having been claimed to be feline-looking, his design makes him more chimp-like in appearance, especially when (during the episode The Strange Case of Minimus-Hyde) his head was stuck in grumbler mode, he transformed into a giant, hulking, ape-like beast.
- His 'good' face sports eyes with white sclera and black pupils, while his 'evil' face's eyes have yellow sclera and red pupils.
- His voice changes as his face changes. His 'evil' voice is gruff and accusing, while the voice of his 'good' side is meek and somewhat nasally.
- Minimus has a strong rivalry with The Chameleon, due to Chameleon's wanting of Minimus's position as Maximus's top underling.
- He is the only main character who has no mentioned parents, siblings or relatives.