Rats are animals that live on both Mobius and the many interpretations of Planet Earth in Sonic the Comic. Many appear as non-anthropomorphic rodents, although there are a few minor characters:
- Rat Bratt is a nasty rat from out of town who appears to be unhappy with Tails' defence of Mobius. He challenges Tails to a race, which he appears to somehow win, despite Tails being much faster when flying. The fox discovers that Bratt had a twin brother who kept racing ahead to the next checkpoint by helicopter but was discovered when his brother wanted some of the credit.
- Vermin the Cybernik was once a rat who sympathised with Doctor Robotnik. He volunteered to become a Cybernik, proving to be just as strong as Shortfuse the Cybernik. When the electromagnetic pulse struck, Vermin was incapacitated and taken to prison, but was reactivated when the Party Pooper's magnet pointed the wrong way. Shortfuse managed to open Vermin's armour by surrendering his Kaamdaarn software and quickly destroyed the villainous suit from the inside.
- Liemould is a rat who lives in Castle Morbidden, serving Queen Vulpecula. As many rats are, Liemould is dirty and cunning, while also sucking up to his mistress.
- Rats often appear in Castle Frank N. Stein. One particular rat campaigned for equal rights for rodents and another let us know that they have feelings. In the dungeon, a vampire rat exists and let his friends know that Chuck D. Head was coming down for "dinner".
- All of the Sky Pirates, bar Captain Plunder and Filch, were originally rats who lived in the Mystic Cave Zone. At some point, they were replaced by a much stupider crew who managed to get locked in The Highview Corrective Centre.
- Casey, as Red Stealth, had to fight rats at the start of his second adventure, before moving on to more vicious, spray-painting goons.
- A rat from the Pleasant Zone alerted Citadel Robotnik to the fact that the Freedom Fighters were in the Zone during Project Brutus.
- Another rat visited Spike's Place for a drink and ended up trying to capture Sonic the Hedgehog for the reward. He soon changed his mind when Sonic turned into Super Sonic.