Chief ferry girl across the River Styx, Botan is the perky shinigami sent to retrieve Yusuke's soul after his unexpected death. She initially serves as his guide back to life and becomes his assistant upon his appointment as Spirit Detective.
Action Girl: Specifically in the Four Saint Beasts storyline, where she easily fends off possessed people with a baseball bat and then attempts to save Keiko.
Heroic BSOD: Has a pretty big one when Yusuke gets the tar beaten out of him by Younger Toguro.
I Wished You Were Dead: After being irritated by Yusuke yet again, she furiously snaps "Why don't you just die?!" Shortly after, Yusuke performs his Heroic Sacrifice to save a kid, and Keiko's resultant breakdown is part of what convinces him to work his way back.
Muggle: Keiko and Atsuko are the only characters listed here without any kind of supernatural powers.
Official Couple: With Yusuke since his revival more or less. Cemented at the end.
Plucky Girl: Hiei's Shadow Sword, insect-controlled humans, the Dark Tournament...she's been able to handle it all pretty nicely. Borders on Bad Ass Normal sometimes (the girl's willing to douse herself with water and go through fire to rescue Yusuke's body!)
Shorttank: Even if she is fond of wearing dresses.
Chekhov's Gun: His pacifier is a device that creates a barrier strong enough to hold S-Class demons.
Chekhov's Gunman: The Chapter Black Saga forces him out of the sidelines, and into the front field for the first time.
Crossdressing Voices: Voiced by Mrs. Mayumi Tanaka in the original Japanese. Is also often voiced by female actresses in the dubs. In the Latin American dub, Child!Koenma was voiced by a woman; older!Koenma, by a man, and he's also voiced by a man in the English dub.
Averted in the English dub, much to Sean Michael Teague's vindication. He talks on the commentary track about how his voice is so high that he's constantly being mistaken for a woman at drive-throughs, so getting a job because he has a higher-pitched voice was great.
Rage Against the Heavens: Behind the scenes, during the Demon World Unification Tournament, Koenma impeached and overthrew his father for the crimes of manipulating Demons to cause crimes in Human World for centuries.
A legendary human psychic that holds a tournament to choose an apprentice to pass on her power to in her old age. With Yusuke's victory, she becomes his mentor, determined to beat skill into him even if he doesn't want it. Unknown to everyone (though not above suspicion), she's also the fifth masked fighter for Team Urameshi during the Dark Tournament. Has something of an interesting past with the younger Toguro brother.
Meaningful Name: Genkai generally means "limit" in Japanese. Has quite a few meanings in context of the show, huh? It's a homonym too; her name is written with the kanji for "illusion" and "sea"- "sea of illusion", which is also meaningful as she's an Old Master with a lot of secrets.
Renowned Selective Mentor: Holds a tournament to determine her successor. However, she also points out that she doesn't consider morality a factor when selecting a successor, and part of Yusuke's entering is so that Rando will not receive her techniques.
Hiei's twin sister, a fact lost only on Kuwabara and Yukina herself. An ice demon, and the object of Kuwabara's affections. She was kidnapped and kept imprisoned for a time by Tarukane because her tears, which transform into jewels, fetch a high price on the black market.
I'm Taking Her Home with Me!: Kuwabara's first reaction upon seeing her in Koenma's mission video, and just about every good person in the cast when they meet her for the first time. By the end of the series Kuwabara's family does take her home, whether as a little sister or as Kazuma's wife is left uncertain.
Demoted to Extra: She kinda disappears after the anime's Spirit Detective arc. Notably, when Keiko, Botan and Shizuru are discussing the Dark Tournament in the anime, Atsuko is passed out drunk. In the manga, the scene is never shown, but all four show up there together.
Dragon Lady: Not shown in the anime, but she seemed to have ties with Yakuza. She and her group threatened the school's principal to let Yusuke come back to school after he came back to life. She also got Yusuke set up a business of his own through her connections at the end of the manga.
All Girls Want Bad Boys: Her and Sakyo in the anime. Thought she doesn't seem to have many illusions about him turning to the side of good, she does listen to his really creepy backstory and show him far more compassion than he deserves.
Only Known by Their Nickname / No Name Given: The dub credits him as "Blue Ogre" up until Chapter Black, and Koenma addresses him as "Ogre." The Japanese version reveals his name during or near the end of the Dark Tournament, and Koenma just calls him "you" before that.
The Watson: He exists purely for Koenma to abuse and explain things to.
Species: Demon Main Power: Ice Manipulation
The Shinobi have done their job for centuries, and done it well. But in recent years, we have caught glimpses of the outside world, and asked; 'Why not us?' Have we not earned the privilege others take for free?
Toya is the ice master of the shinobi of the Spirit World. During the fight for control of the Makai, Toya is one of the demons that Kurama trains to fight for Yomi, though they eventually all disband to fight individually in the Makai tournament.
The Ace: Considered to be the greatest ice master alive.