Yokoo is a 3rd year student at Kamome Gakuen's middle school. He is Minamoto Kou's friend and is usually seen together with Satou.

"Hanako-san, Hanako-san... are you there?"
 
At Kamome Academy, rumors abound about the school's Seven Mysteries, one of which is Hanako-san. Said to occupy the third stall of the third floor girls' bathroom in the old school building, Hanako-san grants any wish when summoned. Nene Yashiro, an occult-loving high school girl who dreams of romance, ventures into this haunted bathroom... but the Hanako-san she meets there is nothing like she imagined! Kamome Academy's Hanako-san... is a boy!
 
(Source: Yen Press)

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A Brazilian Portuguese voice actor from São Paulo.

American voice actor and ADR Engineer working for FUNimation Entertainment.

"Hanako-san, Hanako-san... are you there?"
 
At Kamome Academy, rumors abound about the school's Seven Mysteries, one of which is Hanako-san. Said to occupy the third stall of the third floor girls' bathroom in the old school building, Hanako-san grants any wish when summoned. Nene Yashiro, an occult-loving high school girl who dreams of romance, ventures into this haunted bathroom... but the Hanako-san she meets there is nothing like she imagined! Kamome Academy's Hanako-san... is a boy!
 
(Source: Yen Press)

The second season of Jibaku Shounen Hanako-kun. 
Hanako, Nene, and Kou race against time to uncover the traitor among the Seven Wonders. 
(Source: Crunchyroll News)

The ghostly Hanako-kun and his mortal assistant, Nene Yashiro, usually have their hands full resolving various supernatural incidents in Kamome Academy, but how do they spend their time when they get a break from all that? Come and watch the characters of Toilet-bound Hanako-kun play games, get sick, change genders, and discover world-shaking secrets during their laid-back after-school hours!
 
(Source: Yen Press)