Weren't there more mini reimus? and why were they abandoned?

because they were freaks.

Right...this is the Mareimu from that other 3d one.

...When did it get abandoned? I think we missed some here.

They are striking out into the Wasteland to found Arroyo. Obviously.

*after shooting Mister in the head with a high-caliber pistol

Who have put the dosuyukkuri tag?

I had. Sorry, I originally did it since dosuyukkuri are known for the number of ribbons in their hair (and their size ...). I hadn't drawn the connection to the other 3D comic with the fused koyukkuri at that point.