This is somewhat the order they appeared on the show.

Name: Eiken
Pronunciation: eye-ken
Hair Color: Grey-white
Seiyuu: Ogata Ken'ichi

This nasty guy usurped Genrou's spot as leader of the Mt. Leikaku bandits. He also helped himself to the "flame halisen," the item carried by the leader of the bandits. He also tried to have his way with Miaka when she was captured by the bandits. Eiken's not very smart, yet he still tries to rally the bandits behind his claim to the leadership position. Of course he fails when Genrou, Koji, and...Miaka! come to secure his downfall. Nothing is heard from Eiken again.

Name: Shouka
Pronunciation: show-kah
Hair Color: Dirty Blonde
Seiyuu: Sakakibara Yoshiko

Shouka was Myojuan's girlfriend.

***SPOILER WARNING*** (for tv eps.23)
(highlight to read)
Having fallen ill while Myojuan was away healing people in another town, Shouka died before he could return to care for her. This caused Myojuan to denounce the company of people, to give up being a doctor, and to become ultimately, a hermit. Apparently Shouka died because a demon had inhabited her body and after her death used her to create zombies of those she claimed to have cured. Myojuan, having been informed of Shouka's appearances by an ill Miaka and company, proceeded to confront Shouka and the demon within her, exorcising it and putting a finally at peace Shouka to rest.

***SPOILER WARNING*** (for tv ep. 47+)

Near the end of the tv series, Mitsukake is injured but still healing people as best he can during the Kutou attack. The very last person he heals is a baby girl aptly named Shouka. She lives and Mitsukake, having expended the last of his chi, dies.

***SPOILER WARNING*** (for OVA2)

When Mitsukake's spirit is found by Nyan Nyan, he is with a toddler. A girl with blond hair. Named Shouka. And, she can see him. The toddler is Shouka's reincarnation and her link to Mitsukake is still intact. At the end, when Tenkou is destroyed, the seishi are then able to be reincarnated. We see a sweet image of the little girl with a slightly younger little boy. *^_^*

Name: Tama
Pronunciation: tah-ma
Hair Color: Black and White
Seiyuu: Touma Yumi

Tama is Mitsukake's pet cat and sole companion before Miaka and the others show up. Tama is a male cat who loves to follow and play with Miaka and all of the Seishi. Tama has been known to mimic or imitate people within the show. Tama cares for and worries about each seishi choosing to stay with them at the end of the show.

Name: Cho Korin
Pronunciation: chou core-in
Hair Color: Purple

Korin was Nuriko's little sister.

***SPOILER WARNING*** (for tv ep. 31)
(highlight to read)
She and Nuriko were born a year apart and were so similar they could have been mistaken for twins. Korin died at age nine, having been hit by a runaway cart. Because Nuriko loved his sister so much, he was extremely heart-broken by her death. His parents told him to forget Korin, but Nuriko refused. It was at this time that he decided to live as his sister (AKA, cross-dressing) in an effort to keep her spirit close to him after her death.

Name: Kaika
Pronunciation: kah-eye-ka
Age: 15
Height: 168cm ~ 5'6"
Blood: A
Seiyuu: Ueda Yuji

Kaika is the adopted son of a middle-aged couple living in Bakan village located in Sairou country.

***SPOILER WARNING*** (for tv ep.37-41?)
(highlight to read)
Kaika is Amiboshi found after having almost drown from falling in the river after the failed Suzaku summoning ceremony. The middle aged family took him in as their son, Kaika, who was lost years ago at a young age. Kaika has no memory of his former life, although he still harbors his regrets of being born a Seiryuu seishi. Upon using his seishi powers to heal a sick Miaka, Amiboshi is awakened again, and voices a love for Miaka (as everyone does eventually it seems), and proposes marriage to her with promises of no recollection of past events or problems. Kaika/Amiboshi is noble and loyal to Miaka and turns against the Seiryuu seishi in her protection. Ultimately, Amiboshi tries to persuade Suboshi into taking amnesia-causing bokyakuso broth and returning with him to the Sairou family, but Suboshi tricks him and causes only Amiboshi to forget all again...leaving him near the Sairou family's house.

***SPOILER WARNING AGAIN*** (for OVA1:1-3)
Okay, first off the 1^st OVA was not based on the original manga and mostly confuses the storyline more than it helps it. But, it's still fun in my opinion so i'll include Kaika's part in it here. Basically, Amiboshi had returned to his life as Kaika in Sairou with no recollections of being a Seiryuu seishi...until Yui reentered the book world. It was then that Suboshi (who was killed in the tv series) contacts Kaika by their super-cool wonder twin powers and asks Kaika to help him go protect Yui. This awakens Amiboshi's memories and he allows Suboshi to possess his body to go protect Yui. Later, a big fight breaks out between the Suzaku seishi and Tenkou, and it is here that Suboshi (in Kaika/Amiboshi's body) jumps into the fray to rescue Yui, who was being used as a shield by Tenkou. It is plainly obvious that Suboshi gets injured (a hole through his chest is definately injured) and apparently dies after telling Yui that he loves her one last time (and she finally understands). I say "apparently" because reportedly, off-screen Mitsukake is able to heal Suboshi in time. This comes straight from Watase-sensei herself, so we'll believe it. ^_^

Aono's been given his own page, here

Name: Hahm Si-Fan
Pronunciation: ha-m she-fan
Age: probably 15 like Miaka
Height:158cm ~5'1" (estimate)
Hair Color: Black

Si-Fan is the adopted daughter of Byakko seishi Tokaki and Subaru. Apparently her real family died only a year earlier and since then she has been living with the Hahms.

***SPOILER WARNING*** (for tv eps.41-42)
(highlight to read)
Si-Fan was told by her adopted father, to comfort and be friendly to (read: throw self at) Tamahome. Basically, with Tokaki having been a Byakko seishi and having watched Byakko no Miko and fellow seishi Tatara fall in love and have to separate, Tokaki was just trying to save Tamahome the pain of an impossible love. Being a good daughter Si-Fan of course did as he asked, and became "friendly" with Tamahome. Miaka, of course, could sense that something was going on and became very jealous. Coincidentally, Si-Fan looks remarkably like Miaka but with darker hair and good cooking. So, just when Tamahome seemed ready to permanently give up Miaka, Miaka ran headlong into danger (no, really?) causing him to chase her and realize how much he really loves her. So Si-Fan gets the shaft.

Name: Toki
Pronunciation: toe-key
Hair Color: ? (he's bald)

Toki is the adopted grandson of Suzuno. As a monk, he takes care of Suzuno in her old age, never really believing her stories about a world inside a book where she was Byakko No Miko until Keisuke and Tetsuya arrive seeking answers. Also, later he becomes a good friend of Miaka.

Name: Houki
Pronunciation: hoo-key
Hair Color: Pale Purple

No, let's let it be a surprise. ^_^

***SPOILER WARNING*** (for tv ep.45-48)
(highlight to read)
Houki is Emperor Hotohori's wife and Empress. Hotohori married her sometime between Miaka and the others leaving for Hokkan and them returning from Sairou. Upon the end of the tv episodes, she was pregnant with the next Emperor of Konan country, Boushin. When Miaka first sees Houki, she mistakes her for Nuriko and immediately hugs her. Gee, Hotohori married a Nuriko look-alike, wouldn't Nuriko be proud (or jealous).

***SPOILER WARNING AGAIN*** (for OVA2:2)
In the 2nd OVA series, Houki is overcome with sadness over the death of Hotohori and refuses to leave her bed or care for her son. It has already been two years since Hotohori died, yet she still grieves and does not leave her room. It is only through Hotohori's undying love, when he enters Taka's body so that he can hold his son, that she leaves her mourning and re-enters the world as Empress and mother. (This episode has one of the most touching moments, when Miaka et al enter Houki's room, only to discover Hotohori's spirit caressing her face. *sniff*)