Monster Musume / Daily Life with Monster Girl - And plunder all the kibble you can nibble!

Why always whenever it's a gyate Kobold, there are one happy Polt, one unhappy Polt and one tiny Polt, which also has green eyes instead of blue?

In the beginning there were two versions of the Polt gyate, the wan with the :D face and the :< face, they originally had green eyes because Polt was generally assumed to have green ones before the canonical coloration was set to blue. This mistake was quickly fixed and now there were four versions, green eyes, blue eyes, :D and :<.
Then came the first edit:
and a genius /a/non ran wild with it and created the following:

From there the idea of the three Poltling siblings was solidified and it's generally assumed that the green eyed tiny one is blind, and also the admiral of the Scurvy Dog.