Papyrus probably looks a bit silly. As he's switched to Chemist, that means Cool Scientist is in his passive slot. Which means he can fully utilize his B.A.R.R.E.L modifier skill.

So basically, we have Papyrus in a big, holographic barrel toddling behind the others. His footsteps are light, and he'll pause every few steps as an added precaution. This probably looks rather absurd.