Bertram needed a redesign badly and after drawing his younger brother Galladan I decided why not redesign, draw, and then color Bertram to sense he'll be appearing in the comic after awhile.
Bertram is a maned wolf who will be appearing in the Sen comic. I can't put anymore information, because I try my best to not give spoilers. And if your curious about the comic here's a link to the comic cover: https://www.weasyl.com/submission/1291367/sen-comic-cover