She trains Yusuke in the Spirit Light Wave Fist (Reikō Hadō Ken) aka the Spirit Wave in the English dub and coaches him to the extreme. Though she may appears nasty towards Yusuke and the others, she truly cares about all of them, and tries to lead them down the right road.  Genkai is an elderly martial arts expert who lives alone in a very large temple. She first appears during Yusuke's second case as he infiltrates a tournament she is holding to find a successor to her techniques in search of the demon Rando. Genkai is a legendary reiki master, known both in the human and demon realms. Yusuke ends up winning the tournament, defeating Rando in the process, and is taken on as a student by Genkai.  ~!When she was 50 years younger, Genkai and the younger Toguro brother were lovers and teammates in an earlier Dark Tournament. After winning, Toguro decides to become a demon, while Genkai returns to the human world, creating a split in their relationship. She enters the next Dark Tournament with Yusuke, disguising herself as the "Masked Fighter" in order to once again face Toguro. Her signature technique is the Spirit Wave, an outpouring of spirit energy from the whole body which can be directed through several different variations. This makes her technique effective in healing and purification, in addition to combat. A side effect of using this power is a shifting of the body's cells which leads to a temporary reversion to the form in which the wielder was at their most powerful in life. In Genkai's case, it allowed her to briefly regain her youth.!~  Although Genkai is of advanced age and her physical and spiritual strength had gone down, she is still a fighter to be respected and feared. Even after she gave up most of her power to Yusuke, she still is capable of using some Reiki notably during the Chapter Black saga.

Urameshi Yusuke, 14 years of age, is about as troublesome and violent as teenagers come. He is constantly ditching school, causing trouble, and getting into numerous fights everyday. One day however, he does the unexpected, sacrificing himself to save a young child. Such an action, was never ever expected, especially coming from someone as troublesome as Urameshi Yusuke. The afterlife is not prepared for Yusuke, as they never thought he would make such a sacrifice. Nowhere to go, and dead, Yusuke becomes a ghost and must earn his way back into existence. 
Yusuke is "employed" by Koenma, who is in charge while his father and ruler of the afterlife, King Enma, is away. Under Koenma's command, Yusuke helps to stop menacing demons that threaten the lives of people everywhere; whether by stealing priceless and invaluable items and destructive weapons, or by wreaking havoc on humans everywhere. 
Throughout Yusuke's journey, he is usually joined by; his arch-rival, and local bully, Kuwabara Kazuma. He is also joined by two demons named Hiei and Kurama, whom are ex-convicts of the afterlife that managed to escape from Koenma. 
This group of unlikely allies goes on to participate and struggle in battles that have outcomes that determine the fate of humanity! 
(Source: AniDB)

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Mother of [John Burgmeier](https://anilist.co/staff/95251/John-Burgmeier).

Formerly worked on English language dubs for Animax Asia, currently residing in Toronto, Canada.

Yusuke Urameshi was a tough teen delinquent until one selfless act changed his life...by ending it. When he died saving a little kid from a speeding car, the afterlife didn't know what to do with him, so it gave him a second chance at life. Now, Yusuke is a ghost with a mission, performing good deeds at the behest of Botan, the ferrywoman of the River Styx, and Koenma, the pacifier-sucking judge of the dead.
 
(Source: Viz Media)
 
Note: Volume 7 contains the special story "Yuu Yuu Hakusho Tales: Two Shot" (外伝. TWO SHOTS)

These are two recap specials that focus on Team Urameshi's matches in the Dark Tournament, with a few character songs playing in the background. 
There are also two shorts at the end of each episode, both of which are about 1:20 long. 
Eizou Hakusho Series: Ankoku Bujutsukai no Shou - Gekan 
-Group Photo 
Eizou Hakusho Series: Ankoku Bujutsukai no Shou - Joukan 
-Koto's Interview

Millennia ago, a war was fought between the Netherworld and the Spirit World. Ultimately, the Netherworld was destroyed and Lord Yakumo, the King of the Netherworld, was banished to the depths of space. Now, five defenders from the Spirit World must team-up against Yakumo's Demon-Gods for possesion of five, mystical sites. But Lord Yakumo is dangerously close to reclaiming the Power Sphere - the source of the Netherworld's energy - and once it is again in his possession, our world will become the new Netherworld.

A four part OVA series about Yusuke's weird dreams. 

Togashi gave this doujinshi for free at the 1994 Summer Comiket. It contains some random drawings by him and his friends, short weird comics with the YYH cast, an interview and an essay. 
This entry covers only the comic chapters.