I don't know if this is a hot take, but I honestly think this is the best anti-teamer character in the game.

Theres one reason for this: Glacial Cinder.

This move has armor and launches one person far away from you, making it ideal against teamers. Additionally, the move only has a 13 second cooldown so you can use it quite a bit.

This gives you a good amount of time to finish off the other one.

The other moves also work quite well.

Hell Assault has instant startup, breaks block, and moves you and another player far away.

Phantom Shot has quick startup, and provides hyper armor while launching an opponent far away.

Cinder Bind creates a safe zone where you can reduce your cooldowns and evasive bar.

You also heal when you kill someone, so you are plenty capable of staying in the fight.