Xautls aren't fat, the 'fat' you see from them is rather just material for them to grow more legs/grow longer, the longer they get the thinner they become. At their longest length, they seem to be a lot more serpent-like. They still have many legs, just more like that of a millipede's.

-Incrypt

The ring of material around their necks can be different, they also have different patterns and varying eye shapes, this one just turns out to have become the infamous 'pretty boy' for it's patterns/colors.

#monster