Honestly, too many to list, so I'll pick a few:
Todd from Fox and the Hound for being naive and honest.
Blackberry from Watership Down for his cleverness (much more prevalent in the book)
Nick from Zootopia for his smarty, realist, attitude
Any otter from Redwall for their playful nature and gushing over shrimp and hotroot soup
Zazu from The Lion King for his dead-pan humor about things