***SUPPORTING*** The supporting characters show up throughout the show and most don't have very large cast roles. But they do deserve to be mentioned:
~~Atsuko Urameshi~~
Atsuko is the young(28 years old), single mother of Yuusuke Urameshi. She spends days at a time at the bar and has no job. She does, however care a great deal about her son she worries constantly that he will die again, and makes sure he is admitted to school (even bringing gangsters(yakuzo) along to 'reason' with the superintendant.) She is alchoholic and has many problems but she has a good heart.
Jorge is the blue oni that is constantly at KoEnma's beck and call. He puts up with all the abuse KoEnma throws at him and is in the constant state of panic/weeping. He is a commentator for most of the battles throughout the show and even helps Koto out toward the end. He's an excellent groveller. All in all he's just a nice guy that seems not to mind being abused by people around him.
Sayaka in the anime is a spiritual investegator sent by KoEnma to see how Yuusuke is doing at growing his egg. It is her job to decide if having him come back to life will really be a good idea. Despite her childish appearence she is very intellegent.
In the manga, Sayaka is a little girl spirit that is very lonely. She lures a little boy into her house and plays with him, but it starts to tax on his living soul and Yuusuke and Botan have to settle Sayaka's spirit.
Hinageshi - Is another Ferry girl that works under Botan. She shows up only in the movie to fight against Yakumo. She wears a traditional shrine maiden outfit (white kimono with red hakama) and seems to look up to Botan as a mentor. Hinageshi acts slightly younger than Botan, and obviously doesn't have as many years experience behind her.
Another boatman of the dead, she spends most of her time researching for KoEnma. She is much calmer than both Botan and Hinageshi and seems lethargic much of the time. According to another fan that has read all the way through the manga, KoEnma has a thing for Ayame and Botan cheers him on in his pursuits of her. You decide what it means.
This is Kurama's human mother. She begins the show with a very weak heart, and is in the hospital. Later on she marries a man who has another son with Kurama's same human name. (Yes it's confusing.) She's a very warm and loving woman who would do anything for her son.
This is Kurama's step-brother. He's younger and really looks up to Kurama. The two get along very well. He is later used as a tool to get Kurama's cooperation in the Makai. We all know what happens when you threaten someone Kurama cares about ^^;;
These three guys are members of Kuwabara's gang. They all act tough but are really nice guys who enjoy playing videogames and defending their school's honor. Okubo himself, has a part time job and has to take care of his sick mother and his siblings. He's the one you find out the most about. They all care about Kuwabara a great deal just like Kuwabara cares for them.
Is the principal of Saraiashiki Junior High School. He's a kind man who worries about his students and truely wants them to succeed. He makes it his mission to help the troubled students even when they don't want to be helped. He keeps the other teachers in line whenever he catches them doing things to harm the students. He's very fair and just.
Is one of the corrupt teachers of Sarayashiki, he tries to make Okubo loose his part time job by tricking Kuwabara into fighting then making him get a good score on a test. He even erases one of Kuwabara's answers so he'll fail after prodding from Iwamoto.
Iwamoto is a big, burly teacher that is out to get Urameshi. He is disgusted by the boys reputation and wants him out of the school. He worries exceedingly about the school's reputation and how students like Urameshi and Kuwabara degenerate it. He never seems to realize he is just as bad as the students he is out to get.
Is Kuwabara's cat, a very cute little ball of fur that is used against Kuwabara at one point. Kuwabara really loves cats and you can see him playing with Eikitchi throughout the series.
~~The Reikai Special Defense Team (Toku Mo Da Yo)~~
A group of people from Reikai who's job it is to put out any fires that arise in the three worlds, so to speak. When a major problem erupts and the regular lackies can't handle it, these are the strongest of the Reikai who go to try and put an end to the problem.
Is an ex Rei Kai tantei. She is a little like Yuusuke, personality-wise. Obviously she has calmed down with age but she is still an excellent fighter. She used to be short and overweight. In one year she grew a foot and didn't gain any weight, this was the same year she became a spirit detective. She now has two children both with spiritual power and a husband who is completely normal, and writes.
This is Kuroko's husband, he is a novelist and a calm man. He has no spiritual powers like his wife or his children do, and the whole spirit thing intrigues him and scares him at the same time. He truly loves his wife and children and seems to enjoy Yuusuke's company too.
These are the ever exciteable children of the Kuroko household. They inherited their spunk and rei-ki from their mother. They enjoy guarding the house and pretending to be drunk, they get along well with Yuusuke.
Puu is the result of Yuusuke's spiritual test. He is the spirit monster born from the egg that Yuusuke used for the Trial of Resserection. Puu is quiet and sweet, he helps when he can. He can fly flapping his long ears. He also feels any pain that Yuusuke feels. If Yuusuke dies, Puu will die with him.
Koto is the announcer for both the Ankoku Bujutsukai and the Makai Bujutsukai. She is a cat demon and good at acrobats. She's extremely enthusiastic and nearly fearless. She's a crowd favorite.
Juri was the refree in the Ankoku Bujutsukai. She is a sea demon and judges very fairly. She knows the rules backward and forward. She's a little timid on occasion but so would anyone who had to be in the midst of the malay caused by the fighters in that tournament.