M1, M2, and M3 are members of Team Ichigaki in the Dark Tournament. Their real names, however, are, in order, Yen, Kai, and Ryo. Every since they were children they were trained by their master, Mitamura, and learned martial arts. However, when Dr. Ichigaki poisoned their master, the three gave their freedom up to get Ichigaki to heal their master. Dr. Ichigaki then implanted Blood-Slaver Nodes, which can only be removed at the cost of their host&#039;s life, on their backs, putting them under his complete control and largely increasing their strength. Their souls remained trapped inside and unable to do anything, although all three wanted to be free of Ichigaki at all cost, even death. Their souls did have some abilities, however, as shown by how they sent Kuwabara a message in their dreams explaining their pasts. All three of them are very skilled. M2 and M3&#039;s attacks are invisible to those without sufficient spirit training, in contrast M1 distracts the enemies with visible attacks. They fight extremely efficiently as a team, using their attacks to cover each other and keep their opponents on the defensive.    The three make their first appearance during the preliminaries, where they win their matches without a single loss and easily kill a member of the opposing team who tried to kill them. The next day, while Kuwabara was sleeping, they sent a message to him that explained how they became Ichigaki&#039;s servants. In the Dark Tournament pairing, Team Ichigaki is the first team they fight during the main tournament and have a team battle with them against Yusuke, Kuwabara, and Genkai, where Yusuke and Kuwabara were initially unable to see though their attacks at all. Under Ichigkai&#039;s commands, they neutralize Kuwabara from fighting, and the anger at Ichigaki gives Yusuke the ability to see though their techniques and attack them successfully. Genkai then used a special technique that gave their souls the strength to choose if they are corrupt or pure, and their souls removed the Nodes without killing their bodies, winning the match for Team Urameshi. Although at first they felt that they should not be allowed to see their master, Genkai explained to them how they were healed, and Mitamura forgave them. Kai then attempted to take Kuwabara&#039;s place in Team Urameshi to make it up to them, though the tournament rules forbade it. It is also shown that all three of them and their master made it out of the arena alive after the final matches.

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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Non-anime roles: ~!
Alan Parrish (young) in "Jumanji" (live action movie) (Japanese)  
Chizuru Nanase in "Refrain Love 2" (VG) (Japanese)  
Chizuru Nanase in "Refrain Love" (VG) (Japanese)  
Guido in "Grandia" (VG) (Japanese)   
Pugsley Addams in "The Addams Family Values" (live-action movie) (Japanese)  
Pugsley Addams in "The Addams Family" (live-action movie) (Japanese)
!~

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