Gehaburn/Tropes

A-G
Attack of the 50-Foot Whatever

BFS: The form Gehaburn is currently in is the Jason's mighty cleaver, due to being sealed inside. The Dreaded: Have you seen the names this guy has?

Eldritch Abomnination: The resident abomination of the series.

H-P
Humiliation Conga: While it's not set in stone, merely an idea Darkrai is throwing around, Gehaburn was sealed inside a sword by Jason prior to the story, and will break free from his sealing inside the sword and become a major villain....only to be sealed in the form of a sexy woman that will eventually join Jason's harem.

I Have Many Names: Gehaburn, Gremory, Deidarabotchi (Giant), or   Fuhengareeima Ipponboshi.
 * Names To Run Away From Really Fast: The latter name means "Everlasting Twilit Shadow Demon: One-Legged Star". When it came to running, Jason never got the memo.

Irony: All around. For starters, it's name, Gehaburn, is from a sword that grows stronger by absorbing souls. It's soul was absorbed INTO a sword and made the wielder stronger. In it's human form, it wears miko clothing. It's a demon. Because, fuck logic.

Kaiju

Mix-And-Match Critter: Snakes and Foxes to be exact.

Multiple Tailed Beast: Though his tails end in heads, he's a legitimate example.

Q-V
Sealed Evil In A Can: More precisely, a sword.

W-Z
Yōkai: Gehaburn's demonic form is somewhat a combination of the Yamato no Orochi and the Kitsune no Yōko.