Titan

The Blob

Also known as "A Bolha"

The Blob is the main antagonist in Titan that can mutate into grotesque forms and mimic human behavior. The Blob has the ability to mutate constantly if it is in a dry, warm environment with a plentiful food source. The Blob can continue to mutate unless its host is destroyed properly. According to a document that Stephanie finds, the Blob has lived in the Atlantic Ocean for centuries and has never been discovered.

The Soldiers

Also known as "Mutants"

The Soldiers are a mutated form of the soldiers ordered to defeat the Blob and rescue the TITAN team. After an encounter with the Blob, they mutated into zombie like enemies. The Soldiers are swift, grotesque enemies that plague the TITAN shuttle first appearing in Chapter Four: The Mutations. The Soldiers are described as "white and bloody monsters" with "gray tentacles and a split face." They move with a limp and hiss. The only way to be properly defeated is to destroy the head completely. 

Darryl

Darryl is a mutated form of the once-alive solider, Darryl Whaley. He has multiple mutations, each more intense than the other. Darryl was with the soldiers to protect the TITAN team, but his whole crew was killed, and he was left badly injured. Stephanie patches him up, and for a moment, he's a defending ally. But at the end of Chapter Two: The Emergency Broadcast, he mutates into his first form. Stephanie manages to defeat him, but he resurfaces three more times. His final mutation is killed by the Blob before Stephanie has a chance to defeat him.