Genkai, aging master of the Reidoha (or Spirit Wave) fighting technique, wishes to pass her knowledge to one worthy pupil before she dies. Yusuke is chosen to be that pupil, and he soon discovers Genkai's training to be the most difficult ordeal of his life. Despite her advanced years, Genkai constantly amazes Yusuke with her ability to perform superhuman feats of strength and agility. Her wit is as finely honed as her technique, and she possesses the wisdom that comes from a life rich with experience. Impossible to intimidate, she stares unflinchingly into the face of danger, ready to meet even the most daunting of challenges.
Son of King Yama, ruler of the Spirit World, Koenma is left in charge of day to day operations while his father is away on vacation (a chore he despises - too much paperwork!). Koenma's youthful appearance is quite deceiving - the little prince is actually over 700 years old! Koenma possesses the wisdom to accompany his years, and can pose a rather commanding figure in spite of his diminutive size. There's only one thing that Koenma fears - making his father angry!
Kayko is Yusuke's closest (and at times, only) friend. She and Yusuke have known each other since they were little children, and although he would never admit it, she is probably the person that he cares most about in the world. As such, Kayko has a unique ability to talk sense into Yusuke when he is being stubborn or unruly. Kayko is one of the leading students in her school. Intelligent, friendly, and outgoing, she is well-liked and respected by her peers. She is confident, self-assured, and at times a bit head-strong. She is brave in the face of danger, and will not hesitate to put herself at risk in order to help a friend in need.
Not actually a human, Kurama has lived for over 300 years and possesses the wisdom and knowledge one would expect of someone his age. He is generally soft-spoken, almost eerily calm, even in the face of great adversity. But this calm exterior belies Kurama's incredible strength. He is a powerful, ruthless warrior, with wisdom and experience. As such, he is a formidable opponent to all he battles.
Kuwabara is Yusuke's chief rival at Sarayashiki Junior High. Like Yusuke, he isn't the greatest student, but he is an excellent fighter. Next to Yusuke he is a formidable adversary. Kuwabara is driven by an unwavering desire to be the best. Adding comic relief to Yu Yu Hakusho, Kuwabara has an affinity for kittens.
As the name would imply, this fighter's identity is a mystery. He shows up with Yusuke at the port where the ship to Hanging Neck Island is docked. But when a huge battle Royale breaks out on the deck of the ship the Masked Fighter takes care of the whole lot with the Spirit Shotgun. As the Dark Tournament progresses, the Masked Fighter's secrets slowly begin to be made known.
Fourteen-year-old Yusuke Urameshi is the worst student at Sarayashiki Junior High. He gets terrible grades, skips class as often as possible, and has little respect for authority. On top of that, his coarse language and brash, arrogant manner get him into more altercations than he can count. Fortunately for him, he's good at protecting himself. Really good. In fact, Yusuke has the reputation of being the toughest kid in town. But despite his killer rep, Yusuke is misunderstood. His home life is troubled. He is constantly hounded by his teachers, by his mother, and by fellow students gunning for him... As such, Yusuke is generally pretty miserable. Only after being assigned the job of Spiritual Detective does Yusuke truly begin to find his place in life.
Although Yukina appears human, she is actually an Ice Apparition from the Spirit World. She possesses powers that enable he to freeze her surroundings at will. As an interesting side-effect of these powers, when Yukina cries, her tears harden into beautiful jewels. These jewels are very valuable, thus Yukina finds herself a target of the greed of evil men. She has studied the art of Spirit Healing and is very proficient in her abilities.
Large and oafish, Bakken wears the scars of many battles. He takes advantage of an unconscious Kurama by attacking him while he is defenseless. Bakken's White Mist technique creates a cloud of mist from his body that allows him to attack unseen.
A member of the Toguro Team, Bui shrouds his entire body with powerful armor, which holds back his profound strength. He also carries a large axe that he uses to pummel his opponents, and is able to shoot intense energy blasts powerful enough to destroy nearly anything in its path.
The second of the Four Saint Beasts, Byakko is a ferocious white tiger whose imposing size and incredible strength cause even the most battle-hardened opponents to shake with fear. Byakko is able to feed on the energy of his foes and uses the resulting boost in power to increase his size, create additional tiger beasts, and exercise his most dangerous attack the Tiger Scream.
The true leader of Team Rokuyukai, Chu enters the ring as a replacement fighter after destroying the remaining members of his team for being cowards! He is a master Boxer and loves the thrill of the knife-edge match, a dangerous form of combat which he has never lost.
As a result of his new powers, the Doctor has begun to slowly become insane. He can create bugs that inject viruses into victims. The victims will die if the Doctor is not destroyed or knocked out within 10 minutes. He can use his body with more cutting precision than a scalpel. He has also lost the sensation of pain allowing him to reattach his body parts with ease.
Dr. Ichigaki is a demon scientist who took advantage of a group of fighters in order to use them for his own terrifying experiments. Dr. Ichigaki calculates his teams chances of winning to nearly 100%, bringing him closer to his ultimate goal of taking control of Yusuke's body!
If his younger brother has the brawn, the older, smaller Toguro certainly has the brains. He has the amazing ability to shift his internal organs around inside his body allowing him to survive even the most powerful assaults. As long as his vital parts remain intact, this Toguro brother is virtually unbeatable.
Gama is the ultimate master of disguise. That is, he uses a powerful concoction of make-up in order to defeat his unsuspecting opponents. His most powerful weapon is the Make-up of the Seal, which binds an opponents spirit energy within their body.
At only 11 years of age, Gamemaster does not appear to be a terrible threat. However, he can make any video game into reality. Any person in his territory must play by game rules, or they will be destroyed.
Sometimes called 'The Stone Beast', and one of the Four Saint Beasts of Maze Castle, Genbu is a fearsome sight to behold. His deformed body is almost animal-like in appearance except for the fact that it is composed entirely of stone. Genbu can fuse his body with any type of rock. As such, he often travels throughout Maze Castle by "melting" into the solid stone walls. He can use this ability to reach beyond the confines of the castle, in order to deliver messages to demon subordinates on the outside. It also gives him a decided advantage when confronting intruders within his walls.
The grim Gourmet has a most disgusting ability. He is able to gain a person's powers by eating them. Fearless, Gourmet will go after any prospective victim. The more powerful the victim, the more power Gourmet attains.
Gokumonki uses his size, strength, and very large spiked club to crush enemies to pieces.
A dangerous criminal from the Spirit World with over a dozen convictions to his name, Gouki has escaped his prison and is on the loose in the human world. Yusuke is given the assignment of apprehending the villain, but he'd better be careful! Gouki is incredibly strong, and has used his strength to kill more than ten pursuers already! When backed into a corner, Gouki reveals his true form by transforming into Kyuukonki.
Hirue is a demon who acts as a security guard on Tarukane's property. He has orders to destroy anyone trying to break in and rescue the ice apparition, Yukina. When Hirue transforms into his most powerful form, Yusuke and the gang must pull out all the stops in order to get past the hulking monster.
Itsuki was nearly killed by Sensui, but was spared at the last minute and became the madman's partner. He was with Sensui on the fateful day the Black Club met vengeance at the hand of the Spirit Detective. He is a shadow demon that can trap people in different dimensions, and the gatekeeper guarding the inner most depths of Demon World.
Of all the people Yusuke has ever met, Jin is the closest to a kindred spirit. Like Yusuke, Jin enjoys a good time and a good fight. But don't let his amicable nature fool you. This Wind Master has the capability to destroy anyone in his path including his new "friend."
After returning to his body, Yusuke encounters a few old friends being harassed by a rival gang and their leader, Sakamoto. But Yusukes powers begin to manifest themselves allowing him to see that Sakamoto is possessed by an evil spirit named Jyaki. The apprehension of this spirit becomes Yusukes first act as Spirit Detective.
Kaitou would be the top student in his class if it weren't for Kurama. This competition fuels Kaitou's rage and hatred of Kurama. Kaitou has the power of Taboo. He can designate any word as taboo. If someone utters the taboo word or sound, their soul becomes his property.
Although a member of the Toguro team, Karasu was defeated, yet spared by Toguro. Since that time he has pledged service to the Toguro Brothers and follows their orders without question. Karasu is a master at using bombs to his advantage, and he can send his energy directly into an opponents body before igniting it and destroying his target.
One of the semi-finalists in the Genkai Tournament, Kazamaru is well trained in the Nijitsu art of stealth. His considerable fighting skills put him in high demand among government officials as a top professional bodyguard. Kazamaru is able to channel his Spirit Energy through the palm of his hand, emitting a powerful blast similar to Yusuke's Spirit Gun - but far more potent.
Kibano is a man of few words, preferring to let his arsenal of martial arts attacks do his talking for him. Among his more devastating moves is the Big Arm Bomber, an attack which uses concentrated Spirit Energy to amplify the power of his already explosive punches. Kibano sometimes makes use of a special helmet that enhances his Spirit Awareness and allows him to sense, rather than see, the movements of his opponents.
Fresh off his victory at the Dark Tournament, Yusuke is challenged by Kido, who appears to be a normal human. But little does Yusuke know that Kido has the power of Shadow. He can render a person unable to move by stepping on their shadow. He can also manipulate his own shadow to do his bidding.
Kuro Momotaro's body has the amazing ability to memorize any attack made against it causing him to be nearly indestructible. He also carries strange orbs called Steaming Spheres. When he breaks one of the spheres his body becomes covered in armor. And with a plethora of spheres at his side, Kuro Momotaro is sure to only become tougher and tougher.
In order to save their teacher, these three unfortunate former humans sacrifice themselves to the twisted experiments of Dr. Ichigaki. Cold and emotionless, each team member possesses a unique spiritual weapon. Their only reason for being is to bow before Ichigaki's every command.
Mitsunari enjoys teasing Kuwabara, but prefers to let his actions speak for him. He can make himself into an exact physical copy of someone just by touching them. He gains their physical features, memories, and abilities. To make him transform back to his regular form, he must be injured in some way.
Murota has the power to read minds. He desires to use this gift to become a boxer. In doing so he could anticipate his opponent's thoughts allowing him to easily win the match. But Murota's power is at times a painful burden as the thoughts of dozens of people around him can flood his mind at once.
Team Rokuyukai's first fighter, Rinku is small in stature and playful by nature. He is master of the Serpent Yo-Yo, an attack that transfers his spirit energy into the strings of the yo-yo causing them to act as if they are extensions of his own body.
The Earth Master, Risho, is the leader of Team Masho. Risho doesn't mind taking a victory dishonestly, which is why he and his team are on the payroll of the vile Butajiri. He considers results the ultimate victory, no matter the price.
A member of Team Rokoyukai, Roto's greatest skill is the ability to locate an opponent's weakness and exploit it. He devises an evil scheme involving Kurama's mother; if Kurama will not allow himself to be beaten, a demon will destroy her!
Appearing at the Dark Tournament as a nurse, the diabolical Ruka is actually a powerful sorceress on the payroll of Team Masho. She uses her magic to trap Hiei and the Masked Fighter in the medical tent before Team Urameshi's match against Team Masho leaving only Yusuke, Kurama, and a badly injured Kuwabara to fight.
The third of the Four Saint Beasts, Seiryu, the Blue Dragon, stands nearly twelve feet tall and possesses the incredible speed to match his incredible height. His powers enable him to lower the temperature of the air surrounding his body to well below the freezing point, thus giving him a vast arsenal of powerful ice attacks, including his signature technique, the Ice Dragon.
Once a powerful defender of humans and a former Spirit Detective, Shinobu Sensui happened upon the Black Black Club at their worst. He was so revolted at the inhumanity displayed by these criminals that he destroyed everyone in the room eventually going insane and taking on seven different personalities. He took up Sakyo's plan to open the gateway between Demon World and Living World deciding he should be the one to exterminate humanity.
A mild-mannered but powerful young fighter, Shorin enters Genkai's Tournament in hopes of becoming the aging master's pupil. But this quiet young man is not what he seems. Shorin is in fact none other than the monster Rando in disguise! Rando is a terrible creature who has eliminated 99 fighting masters and stolen their special techniques. He now needs only to steal Genkai's power of Reidoha (the Spirit Wave) and he will become virtually invincible.
A member of the Uraotogi Team, much of Shishi Wakamaru's power is generated from his mystical sword, the Banshee Shriek, which has the ability to summon lost souls. This diabolical demon planned on sacrificing some members of his team in the hopes that they would soften Team Urameshi up before he ever stepped foot in the ring.
Sniper can concentrate his energy into the body of anyone else. He can then attract projectiles to his energy, piercing the victim. He is also an expert motorcyclist.
Onji first appears as an old man who looks past his prime as a fighter. He reveals that he personally assembled Team Uraotogi and taught them special techniques that he could exploit on the way to the semi-finals and beyond. But when the wise Genkai discovers Onji's deception, his true form in revealed. The Beautiful Suzuka, as he demands to be addressed is a master of disguise and trickery. He loves life in the spotlight and plans on using the fame and power from winning the Dark Tournament to rule the world.
The leader of the 4 saint beasts, Suzaku looks most human of them all. He can create Cultivated Humans; beings with no thoughts of their own or free will and are absolutely obedient to their creator. Suzaku can also create duplicates of himself giving him a decided edge in battle.
Considered the greatest ice master in the world, Touya is one of the most powerful members of Team Masho. Able to fashion weapons out of ice, Touya's Shards of Winter, an array of sharp blades of ice, is enough to subdue even the most powerful opponents.
Ura Urashima is a small demon that uses a fishing pole as a weapon. He tricks Kurama into believing a sob story about his sick grandmother only to turn the tables and unleash the vile mist of the Idunn Box upon him. Whoever breathes the mist transforms back to a younger age. Despite appearances, Ura Urashima is a capable fighter who isnt afraid to break any rule in the book.
The younger Toguro possesses the ability to increase his already considerable size at will, multiplying his strength by a hundred fold or more. He is a man of few words, but his contempt for humanity is apparent in the scowl that dominates his stone-like exterior. Though he often uses his powers in the service of evil, Toguro is not without honor. He does not destroy without reason.
A powerful fighter with a nasty reputation, Zeru is the apparent leader of Team Rokoyukai. Zeru has the ability to control fire and incorporate it into various dangerous attacks. Hiei respects Zeru's abilities to such a level that he is compelled to attempt his own most dangerous technique in order to defeat the fire controlling demon.
Atsuko is Yusuke's irresponsible single mother. She loves her son and tries to steer him in the right direction as best she can, but her erratic mood swings tend to make her an ineffective parent. Atsuko is aware of her shortcomings, and if there's one thing she wants for Yusuke, it's for him to make something more of himself in life than she has.
Blue Ogre is Koenma's right hand man. But that is not necessarily a good thing. He faithfully fulfills his duty despite taking the brunt of Koenmas frustration.