Look, everytime a new chapter of Deltarune comes out, I get Doggo shaped brain worms cause I roleplayed as him for almost 10 years now and have built up a lot of mental stuff about him.

So heres my interpretation of him in Deltarune. Light World outfit on the left, Dark World outfit on the right.
He is intended to be a thief/rogue archetype, I even referenced Locke's bandana for Doggo's.