Dr. Mager is a mad doctor that works for The Pestilence in The Runner Verse. He creates creatures using the body parts of other animals, including Rowling.
- The name "Mager" is German for "lean" (as in skinny) and was originally pitched as an idea for the Slender Man.
- His visual design was originally an idea for Pestilence.
- He is partially based on The Mad Doctor from the Mickey Mouse cartoon of the same name.
- Dr. Mager believes himself to be related to Dr. Frankenstein, but the validity of these claims are unknown.