Unlock: Finish Konquest mode with all the characters. Highlight Raiden at the character select screen, hold Down and press Start.
OR
Open koffin PN with: 684 Onyx Koins in the Krypt. 

*Note - Blaze has three non-unique fighting styles, no weapon, non-unique moves, and no fatality.

Status: Guardian
Alignment: Unknown
Origin: ?
Weight: Unknown
Height: Unknown
Fighting Styles: Hapkido, Jeet Kun Do, Xing Yi
Weapon: None
Difficulty: Unknown

Bio:
The mysterious Outworld elemental known only as Blaze had long been on a quest throughout the realm. During his quest, an ancient sect of holy men still serving the long dead Dragon King ambushed him on a bridge. The holy men enslaved him through mystic incantations and forced him to protect the last known Great Dragon Egg. For many years he has remained submerged beneath the molten rock of the incubation chamber as 'Guardian of the Egg'.

Special Moves:
Flame Ball: B, B + (A1)
Flame Charge: D, F + (A3)
Flame Uppercut: B, D, B + (A2)

Fatality:
None

Useful Kombos:
Hapkido:
1.) Inner Power - A2, A2, A4
2.) Fever - A2, A3, CS, A2, A3, A3, A4
Jeet Kune Do:
1.) Spotlight - A2, A2, A4
2.) Arson - A2, A2, A3, A3, B + A3
Xing Yi:
1.) Seek and Destroy - A1, A1, A4, A3
2.) Three Powers - A1, A1, A2, B + A1

Ending:
Having been enslaved through sorcery to guard the molten incubation chamber, Blaze was finally freed once the dragon egg had hatched.
He then resumed the quest he had undertaken before being subdued by his captors.