Big Chief

Big Chief(ビッグチーフ, Bigguchifu) is totem bird spirit and the guardian ghost of Goldva, Chief of the Patch Tribe

About
Even though its spirit form is never seen it is revealed by Goldva that Big Chief was a former leader of the Patch Tribe who had finally been revived. It has most likely transformed over the years to a bird like-spirit based upon the Native American Totem Birds, The Raven or The Thunderbird. The Big Chief is most likely a Kami-Type Spirit.

Past
Big Chief was, according to Goldva, once the chief of the Patch Tribe, who like many other, after their death, stayed with the tribe as a spirit and one day evolved to a Kami Class Spirit that took the form of a Totem Bird.

Assault on the Plants
The Big Chief made it's debut when Goldva used it to destroy the Golem with ease not only once but also doing it again after it recovered.

O.S. Big Chief
O.S. "Big Chief"(O.S. ビッグチーフ) Description: By placing the Big Chief within her pipe, the spirit of the former Patch Tribe chief will begin to materialize around her body. Due to its large size, when forming this oversoul Goldva jumps into the air, crosing her arms while holding her pipe. When completly oversouled it takes the form of a muscular humanoid armour for Goldva to wear around her body with, for some strange reason, a large iron ball, ressembling a cartoonish bomb, instead of its right hand. In this form it becomes gigantic, even as large as one of the Five Grand Elemental Spirits, and has the head of a thunderbird with the common Tribal Chief headdress. It also gains waist and wrist armour.
 * Shaman: Goldva, Chief of the Patch Tribe
 * O.S. Type: Spirit Type
 * Spirit Ally: Big Chief(Kami-Type Spirit)
 * Medium(s) Used: Goldva`s Pipe; Goldva`s Body

It was first seen when Redseb and Seyram Munzer invaded the Sanctuary of the Great Spirit and attacked Asakura Hao with Golem. Quickly creating her oversoul, Goldva easily smashed Golem with the large iron ball, revealing its immence strenght.

Attacks

Anime/Manga Difference
Because the anime ended a lot earlier than the manga and the fact that the entire second round of the Shaman Fight is completly changed in the anime, is the Big Chief never seen, nor mentioned in the anime.

Trivia
Big Chief is likely based on the American Raven, a species that is portrayed as a trickster of sorts in many Native American folklore.

Alternatively, it may have been a former Patch Tribe chieftain who eventually lost all ego and became a Kami Class.