The Demons of Asakusa

ronin samurai-like swordsman with heat absorption abilities that’s primarily used through his rune etched katana.

-demon like form that covers body with the collected energy, high pressure explosion is created upon transformation;

- Feral Form almost completely coats his body’s in raging flames.(i.e look to Sekiero/Fire Force for reference)

-  can create similar high pressure explosions from transformation by absorbing all the energy in the atmosphere to drop into subzero temperatures and releasing energy instantaneously to create thermal expansion explosions

- Controlled Form almost completely clads him in a Japanese style divine robe, same/similar runes on sword will be on it(i.e look to Son Wukong for reference)

People comes from a clan of Asakusa(fictional island to the East)that lives in the cold mountain regions that stay there to learn true control over their energy absorption powers.

The leader has the ability to raise the temperature of his palms to the sun. Can adjust at will with his inner palms glowing from red> yellow> blue> blinding white and can turn all to ash. After time skip will evolve to be able to flash freeze any he’s touching as a prerequisite to his even hotter palm flames, can store at will.