Date of Birth: December 27
Height: 180 cm (5' 11")
Weight: 154 lbs (70 kg)
Blood: Type O
Pastimes and talents: Formulating plans, mixing in with a crowd, reading Jump Square every month
Average hours of sleep per night: 4
Favorite foods: Seafood (especially sashimi)
Favorite manga genres: Gags/comedy, horror, suspense/mystery
Favorite type of girl: ...
・Popular with girls.
・Extremely poor eyesight.
・Embarrassed by how many moles he has.
He is Rin's younger brother. Yukio has had a weak body even before birth causing the power of the demon passing onto Rin. He teaches pharmacology in the exorcist at Cross Academy and is an Exorcist himself.
He chose to become an Exorcist upon his late father suggestion.
Yukio is a Middle First Class Exorcist who has gained the titles of Dragoon and Doctor.
It is later revealed that Yukio also posses the power of the blue flames.
(Source: viz and Blue Exorcist volume one manga extras)