Sousuke Mitsuba

Birthday: 28th March (as celebrated by fans)
Age: 13-14 (at death)
Hair color: Reddish-Pink
Eye color: Pink
Favorite snack: Flan pudding
Biggest concern: Can't build any muscle

Mitsuba is a ghost haunting Kamome Academy Middle School's lockers. He was a student at Kamome Academy's Middle School division and a member of the photography club before his death.

After being recreated by Tsukasa Yugi, he consumed the former School Mystery No.3's heart and is now currently the representative of the 3rd School Mystery.

(Source: Hanako-kun Wiki)