Ohhh who's the fluffiest you ask? If you can ignore that the fluff is made of slime particle, it's Definitally me! Kindling's got such a soft, smooth bottom, but Soft and fluffy are two different things!
Uluri's fur isn't soft, but it is fluffy. You can sink right in! Kindling's fur is very soft, though. Trace's fure is both soft and fluffy like a rabbit's would normally. Fluffy king is Uluri.