Houjou Emu is a pediatrics intern at Seito University Hospital. Emu became a doctor because he greatly admires the doctor who saved his life after a mysterious accident. After becoming an intern at Seito University Hospital, a chance encounter with Karino Asuna leads to him acquiring a Gamer Driver and becoming Kamen Rider Ex-Aid.
Personality
Emu is friendly and popular among his patients, although prone to mistakes due to his clumsiness and inexperience. However, he is a skilled gamer who plays under the pseudonym M. Emu believes doctors have to protect their patients smiles, and therefore has no qualms about involving themselves in their personal lives. Because of his optimistic nature, Emu is easily manipulated and confused by others.
Trivia
Emu is the Japanese way of pronouncing the English letter "M". A loose translation of his name means "Life is precious" and "Eternal dream".