La Parka

Once a normal person, he was killed and his spirit selected to work as Mr. Bones' Avatar (Body).

Season 3
Unlike most people, this person wasn't granted eternal rest upon his death; instead his soul was chosen to replace the name of the spirit that was engraved in Hell's eternal throne. Mr. Bones had chosen this man to be his avatar in the ring, and maybe participate in the Holy Grail Wars, but mostly wrestling.

He is vulnerable to holy weapons such as Holy Light Tubes. When these weapons are used against La Parka it will heavily weaken him to the point that he needs to go back to his phylactery to recover.

It was this way that he was defeated by La Parka Negra, a cursed being that attacked La Parka on a few occasions.

Ever since his legendary victory found in an old tape, the current location or mission of La Parka, along the holy sword Excalibur, are unknown.

Episode 9

However, he appeared with the AAA champions when TFR requested a challenge match against them. They were likely souls.

Season 4
As an avatar of Mr. Bones, he appears occasionally when he needs to materialize, most commonly outside of Hell, to severely punish souls or some of his other servants, or when he accepts a worthy challenger.

Episode 3

He stole Doomguy's soul, and accomplished it using The Grimoire.

Episode 8

Mr. Bones was challenged by a holy man, however, he was not an ordinary human, but an expert in Magecraft and a Master participating in a holy grail war. Not only did he come to this fight fully prepared, he used every underhanded trick he had prepared, and was somehow able to defeat La Parka, dethroning Mr. Bones. Just what could he be planning?

Episode 11

After the banishment of Mr. Bones and apparent destruction La Parka, something more evil appeared and took a new vessel in Hell, known as La Parka II.