Although this is a CGI series, the 2D pencil artist is still extremely important to the production: the original designs of the characters, sets, and props were all produced in pencil first.
The design of the character models involved a lot of trial and error - many designs were tried and discarded before we got to the ones we liked. Once each design was approved, a "turnaround model" (which allows you to see the character from several angles: front, side, 3/4 front, 3/4 back, and back) was produced for each character.