Infinite the Jackal

"Fine... I will teach you fear, then pain, and then... Well at least the fear and pain will end." - Infinite, Sonic Forces

Infinite is an evil and egotistical maniac. He is closely affiliated to Eggman and his empire, and uses the Phantom Ruby as a power source. He is one of the few people to ever defeat Sonic. After the war ended in Eggman's defeat, Infinite, much like the doctor himself, is completely missing.

However, do not be mistaken. He is very much alive. He is infinite, if you will.

Trivia

 * It is possible that the deep voice in Sonic's Hourglass that tells Sonic he will never escape is Infinite himself. What he has to escape from is unknown.