Just fully drift compatible but can’t stop arguing to save their lives

Zoro and Sanji in one piece

Nauda and Tythes in weirkey

Yeah

Augustine and Mercymorn from Harrow the Ninth, the second book in the Locked Tomb series.

Gilgamesh and Tarvek

And Gideon and Harrow in the first book :v very complicated relationship

Ooh good pull

MadarFoxfire oh yes, staring me right in the face too, wasn't it. XD

Ranma and Ryoga when they have a common enemy/Akane is in legitimate danger

Nier and Kainé

I think any really good pair of anime rivals should be able to fit into this.

It just adds a certain something to them that really makes the dynamic work.