This is a 1 piece amigurumi worked from the top down.
I used red heart super saver solids in blue, white, green and yellow. I needed 1/4 a skein of the main color and very small amounts of the other colors.
This pattern is easily adapted for the other types of pikmins and I have included a couple of adaptations.
I used a very small amount of white felt, safety eyes and black embroidery floss all of which are optional and can be swapped for yarn.
A darning needle.

I would consider this to be a skill level of Easy if you have some basic skill with Amigurumi.