I have a few ideas
First I think that the kid characters, like Timmy, should do a back flip animation and yell "whawhooooooooo!" just because it would be funny and unexpected and would fit the characters.
Second Look through different mythologies and incorporate in some of the characters and monsters, as well as d&d monsters maybe? Also kings and rulers inspired by the real world cultures that you can interact with like the sultan, and even non human rulers.
Third you should be able to recruit the goblins that the witch fights, kinda like with the monkey bounty. also wild animals, bandits and mercenaries and the like should show up at some point.
Also maybe a priest and more mystics/ magic users, and I think the stump and plant girl story lines should be interconnected if they aren't all ready.
Also groups that are only mentioned like the captured soldiers and the pineapple merchants should have Characters to represent them. Also political factions like the Roman Demes and job class guilds should be introduced as well, and political leaders like your kingdoms lords and senators and chieftains as well.
Finally more buildings like the Tavern and grainery, maybe aqueducts, and libraies ? and you can see them in the cityscape outside the window.