I wonder if it's intentional that we have yet to meet a student or character from the Land of Dawning, especially since NRC is located there. I think the only characters we've heard of coming from there are Silver's bio family. We also haven't met a character from the Kingdom of Heroes or the Sunshine Lands yet (I think). I'm wondering if the game intends for those areas to be where more of the Disney protagonist characters come from since the names of the places seem... more positive or brighter? "Sunshine" and "Dawn" are very light-focused words, and "Kingdom of Heroes" seems pretty on the nose for where hero characters would come from.
As far as I'm aware, yeah, Silver's parents (and Heinrick) are the only characters we know of from the Land of Dawning. We haven't met anyone from the Kingdom of Heroes or the Sunshine Lands yet either--unless, of course, you count the references made to historical figures. For example, the mermaid princess is said to have married a prince of the Sunshine Lands.
It very well could be that more of the twisted Disney heroes come from those places! I think it could also be the case that like... mobs come from them and we're just not aware since they're not part of the main cast? We also have to remember that some countries we're aware of, like the Shaftlands, span large tracts of land. It's entirely possible that heroes come from smaller areas of particular countries and we just don't hear about them because those spots aren't relevant to the main cast. If we assume that twisted heroes or supporting characters come from the same regions as the twisted villains, many heroes also do hail from the regions we know of: Rielle from the Coral Sea, Cheka and Falena from the Sunset Savanna, Chenya from the Queendom of Roses, Kalim from the Scalding Sands, etc.
It'd be cool if we could visit the Sunshine Lands, Land of Dawning, and Kingdom of Heroes someday :> I'd like to see what they're like... maybe meet some new chracters while we're at it (winkwink nudgenudge)!
















