(this is still in development)
Niko doesnt have a official sensei or even a team, so Tsunade assigned Kakashi to be Niko's mentor. At first, they struggled to get along, but over time they began to know each other better and get along more easily. However, Niko is the more difficult one, he's impulsive and rebellious, he dislikes being told how to do things and can be incredibly stubborn, so Kakashi has to have a LOT of patience with him. And both started have some deep feeling with each other, mostly from Niko, but they dont wanna be in a formal relationship (and even that can put them in problems too), so they started have a queer platonic relationship!, even they are in a open relationship, both can be with anyone they want (ofc with their limits and conditions)