Shikai Release Command: Incinerate - Shijin Jakka!
Shikai Appearance: Shijin Jakka's released form is a double headed, two handed axe. It's blades are covered in flame.

Spoiler:

Shikai Powers: Shijin Jakka has the ability to engulf whatever it hits in flame, except for other blades. When it swings, it leaves a flaming arch behind it that lingers for a few seconds, these flames are incredibly hot and will devour whatever they touch.
Shikai Abilities:

Taimatsu:

Jōkaku Enjō:

Bankai Release Command: Bankai! Zanka no Ono!
Bankai Appearance:

Spoiler:

Bankai Powers: Upon activation, any flames produced by Shijin Jakka are devoured by the blade. Senrei himself becomes clad in a thick, bright red suit of armour. This armour is, in fact, solidified flame. Even the most minute of brushes against the surface of Senrei's armour, or any portion of his blade, will result in the area that touched it being turned to ash, and a large area around it being covered in fourth degree burns. Zanka no Ono destroys the water in the atmosphere, making all forms of ice and water based techniques useless. However, even in it's completed form, Zanka no Ono, like Senrei's father's Zanka no Tachi, can only be sustained for a certain period of time before it destroys the wielder as well. To be specific, after 8 turns of activation, Senrei's skin gets to become covered in first degree burns from wearing the suit of armour. After 12 turns, these burns become second degree. After 18 turns, Senrei's blood will begin to boil, and his life will end. These turns are accumulative, meaning if Senrei disables his Bankai after 17 turns, reactivating it in the same thread will only grant him a single turn before he dies.
Bankai Abilities:

Zanka no Ono, Azuma; Kyokujitsujin:

Zanka no Ono, Nishi; Zanjitsu Gokui:

Zanka no Ono, Minami; Kaka Jūmanokushi Daisōjin:

Zanka no Ono, Kita; Tenchi Kaijin: