Amidamaru

Amidamaru is Yoh's main spirit, a samurai who died 600 years ago. Legend says that Amidamaru disobeyed his shogun and killed a great number of people fighting to escape. Now, he and Yoh are friends along with their spirit/shaman relationship.

Ashcroft Kanna's main spirit who does Izuto Brutto.

Bason Bason is Ren's loyal spirit, who is almost as powerful as Amidamaru. Bason proves his loyalty when Ren confronts his father En Tao to break the seal of hatred that has cursed his family. Alone, Ren is no match for his father, so to prevent his father from using Bason as a puppet, he commands him to leave before he is defeated. Bason unwillingly goes, and immediately seeks out Yoh and persuades him to help. Bason knows his master’s heart and can see the good in Ren at all times.

Billy A man who sometimes shows up whenever Ryu calls Oversoul Big Thumb. He and Ryu have a special bond, and if he's in the area, he'll give the boys a life.

Chuck Mari (aka Marion)'s Oversoul who does Magnum Craft.

Eliza (aka Mephisto E) Eliza was Faust's beloved, whom he had saved from a terrible illness. The two married and opened a clinic, but Eliza was shot and killed. Faust turned to necromancy to bring her back to life, but never truly succeeding until Anna helped.

Jack

Macchi (aka Matilda)'s Oversoul who does Trick or Treat.

Konchi

Tamao's mischievously sarcastic fox spirit who seems to despise Anna.

Kororo Kororo is Horo Horo’s spirit and one of the Koro Pokkuru, spirits that live under coltsfoot in the northern lands. They have lived in harmony with Horo Horo’s people (the Ainu), for years. Now, city life has been destroying nature and the Koro Pokkuru are losing their habitat. It is Horo Horo’s dream to become Shaman King and create a vast land filled with coltsfoot for the Koro Pokkuru.

Li Pailong / Lee Pyron Or in the English Shonen Jump, Lee Bailong... anyway, Lee was originally a kung fu master that starred in a number of martial arts films where he alone would take on the forces of evil. He is Manta's idol. Jun is a priest, not a shaman, and Pailong was given to her 17 years ago as her main kyonshi (frozen corpse). After meeting Yoh, Jun sets Pyron free from her binding spell and he freely chooses to be her kyonshi.

Mick Mick is Chocolove's Jaguar spirit.

Morphine Morphine is Lyserg's faithful shaman, who stays by him, even when he disowns her for an X-Law Angel.

Ponchi One of Tamao's meddlesome spirits along with Konchi who despises Anna.

Shamon

Lee Pyron's master who Anna is able to contact to help Yoh in his match against Jun Tao.

Spirit of Fire

Hao's extremely powerful spirit that can change elementals depending on atmosphere.

Tokageroh Tokageroh was once a thief that took up residence in an abandoned bowling alley Ryu's gang was inhabiting as their best place. Initially, Tokageroh possessed Ryu to take his revenge on Amidamaru. Later, after some training with Yoh's father, Mikihisa, Ryu learns to be a shaman and takes Tokageroh as his spirit.

X-Laws Spirits Lyserg’s Angel = Zerual, Marco's = Michael, Jeanne-sama's = Shamash, Meene's = Gabriel, Venstar's = Metatron, Cebin's = Remiel, Denbat's = Raphael, Larch's = Uriel, and Porf's = Sariel

Zenki (red) and Kouki (blue)

Anna's shikigamis were once Hao's shikigamis that were sealed away in his book containing of all the Onmyou teachings (Chou Senji Ryakettsu). Anna defeats them so she can take the book to Yoh. Later, she uses them at opportune times to her advantage. As Anna isn't a shaman, they don't possess her.