A Fallout Yukkuri mod. With random yukkuri spawns here and there, with the occasional (lethal due to rads) Unyukkuri random event.
we discussed an idea like that on the fanfic groups, basically a mod pack thingy that includes yukkuris and if worked further, even a whole new map like those mods that make new maps for tranquility lane and stuff.
But there would be mainly Average yukkuris with rare ones being adoptable pets ala Dogmeat that you get from the factory. So no enemy unyukkuri, instead a "follower" one.