Do I use line of sight or pathfinding, or both?

I'm struggling with ai behaviour. The situation is as following: npc's are walking down the streets of the city, another npc is coming towards them. At this moment in time, I'm trying to figure out how to make them move around each other and continue on their merry way.

I experimented a bit with pathfinding, but I don't really want the npc's to have set goals, other then to walk around and I haven't figured out how to do that yet.

The npc family has these behaviors:

Bullet: When they spawn they go in the direction of the spawner.

Pathfinding: Nothing in here yet

Line of sight:Nothing in here yet

You can use line of sight to detect when they are approaching each other and based on their angle have them start adjusting their angle slightly away in either direction. You could also do an overlap at offset check and if they collide then have them start angling away in either direction, or you can use vector Y to move them up or down the screen to avoid each other if that doesn't look too weird. I wouldn't use pathfinding for this.