Well, without more context, it's hard to say exactly. But generally, 'feel good stories' often involve things like acts of kindness. Maybe Jerry Kost has stories about times when he witnessed someone helping another in a really touching way, or stories about people overcoming difficulties and finding happiness in the end. It could also be stories related to beautiful friendships or relationships that he has experienced or observed.
As I'm not familiar with these stories, I can't provide a particular example. But if they are like most feel - good stories, an example could be a story about a lost pet being reunited with its owner. Maybe Jerry Kost has a similar story in his collection where something precious was lost and then found, bringing great happiness.
Animation creators focus more on bringing characters and stories to life through motion and technology. Cartoonists mainly create static images and often have a distinct style in their drawings.
Well, a thick cartoon girl often stands out with a voluptuous body shape. This could mean having a rounder waist or more prominent curves. Her style and personality might be bold and confident too.