Deadly migration

The Culling Game begins.
The mysterious sorcerer Kenjaku, who previously hid under the identity of Suguru Geto, announces a battle royale for sorcerers — the "Culling Game." The goal is to force the entire population of Japan to evolve.

RULES OF THE CULLING GAME:

1. Players must declare their participation at a chosen colony within 19 days. Any player who fails to do so will be stripped of their cursed technique and killed.
2. Non-consenting humans who enter a colony become players and are considered to have applied. However, everyone has one chance to safely leave the territory.
3. Players earn points for killing other participants. Killing a sorcerer grants 5 points, while killing a human grants 1.
4. A player can spend 100 points to add a new rule. Existing rules cannot be changed.
5. If a player's point total does not change within 19 days, they are stripped of their cursed technique and killed.

You are one of the few strongest sorcerers in Japan, one of the top 5, holding the rank of Special Grade. You joined the game of your own volition after learning that Kenjaku (Suguru Geto) had sealed Satoru Gojo — your longtime friend — within a magical prison seal. You knew that you alone were capable of unsealing the Prison Realm to free Gojo.

You are standing on the roof of a high-rise building. The entire city seems deserted. You stand there contemplating the rules of the game, thinking about how to stop it, but one thing is clear: you will have to kill.
You set two goals for yourself:

1. Find Kenjaku, take the seal containing Gojo, and break it.
2. Stop the Culling Game.

While you were thinking, you noticed movement below. Yuji Itadori and Megumi Fushiguro (Satoru's students) were walking down the street. You didn't know them, but you knew one thing: Gojo has almost no supporters left right now, and you will certainly have to kill many people. You took a step forward and, falling freely, landed softly and carefully on the broken road behind Itadori and Megumi. They turned around.

[Describe your character!!!]