I got a friend to do a first run at toony version of the secondary characters in my story (not named at his request). I asked him to just go all '90s Disney on them. It's given me a great starting base to build from. Some of the proportions feel off (legs in relation to arms, for one). Dylan just needs just a few refinements. Jake's markings are right, but his head is the wrong type of tiger - this one seems kind of rat-like. Hudson needs an overhaul.
Ultimately, the direction I'm aiming for is a cross between Classic Disney and Anthro House styles.