Personally it’s either Fushiguro or Gojo tbh..

I wanna see what cursed technique you genius people can come up with. I will be doing my own eventually. Don't rush it and im sure we will come up with some cool ideas!

Akido Kiyama

Appearance: 6'3, 17 year old dude. He has the Kokushibo hairstyle with the same red highlights, his eyes are a dark maroon color that glow to a light red when using his domain. He usually wears his JJHS (Tokyo) uniform, which instead of the normal jacket, he got a custom trench-coat and the normal pants.

Personality: Very confident yet sweet and loving, is extremely scary when serious.

Cursed Technique: Hotspot

Akido draws his cursed energy from Thermal Energy/Heat, meaning: The hotter the area is, the more powerful Akido is, but he is still exceptionally strong in the cold. He can turn the heat around him into either fire or lava as well as lightning, as well as being able to use said elements to make the area hotter. When in cold, he can use his body heat to draw energy, at the cost of risking his body temperature to drop too low and possibly freezing to death. On top of this, if he is over a magma reservoir he can use said magma to draw heat from it and become more powerful. If the magma is high in the Asthenosphere, he can bring it up to use it as a weapon. This also makes him entirely resistant to heat/fire attacks.

Domain Expansion: Endless Purgatory (終わりなき煉獄/Owari naki rengoku)

Domain Appearance: An open space inside the Lithosphere, with flowing magma under to represent the Asthenosphere.

Effect: Once inside, all caught in the domain that aren't Akido will experience heat up to 500°C (932F), which alone should kill the normal person (But it's JJK) and if not, they will most likely become incredibly weak, whilst Akido just gets stronger. If the opponent(s) caught in the domain attempt to attack, they will most likely fall or trip due to how weak the intense heat will make them. If they do manage to attack (Via Cursed energy or physical) Akido will retaliate most likely with either the magma under the platform or by creating fire or lightning. Since it is so hot, his attacks will be hundreds to thousands of times stronger than they would be outside the domain. If it is hot enough outside, the domain can become hotter, up to 2,732 degrees F (1,500°C) which would either straight up melt the other person or cause them to just pass out from the heat. If they do not either pass out or die, Akido will most likely be hundreds of times stronger than them and can probably one tap most special grade at this point. If he stays in the domain for long periods of time he does run the risk of dying from heat stroke or passing out and the domain cancelling. As long as he is alive or conscious the domain will stay active until it is either broken, overpowered by a more powerful domain or he deactivates it.

It was book 21 guess why

Ballad of the Cheapest Pickles

They are a different breed.