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Swirlix and Slurpuff have underdeveloped red eyes because they see with their sense of smell. It's constantly sticking its tongue out because smell and taste are closely linked in the brain and tongues help noses smell food.
Slurpuff is based on a toy poodle while Furfrou is based on a poodle that still has its dignity, and that's why they both debuted in the French region.
The red collar around Slurpuff's neck (it has a neck?) is based on a nobleman's ruff, tying in with its habitat right outside of Parfum Palace. It can also be interpreted as a bib because of its appetite.
This thing is so stupid that it loops into brilliance and that is why it is the best 6th gen mon.