I think that we should distinguish scout heroes for dwarvish kingdoms as well.
My suggestion is that Ered Luin will have young Bilbo, part of the Iron Hills will be Hilda Bianca from the Lake town and in the Erebor you can find old Bilbo. So all three kingdoms will have different (not dwarvish) scout heroes.
Hilda concept as a scout hero for Iron hills:Why Hilda?
1) Hilda will be only scout hero for Iron Hills where she could go sell herbs - it is near to the Lake town geographically.
2) About Lake town were two movies, but in the game Lake town will have only one hero - Bard.
3) Unknown actress who played Hilda had more screen time than for example Cate Blanchett (who has two oscars and her character definitely is not non-canon like Hilda). By the way she will have more screen time even in the upcoming extended edition:
https://www.youtube.com/watch?v=elEXyQ9KgfA&feature=youtu.be&t=265I tried to capture most of the aspects from movies in her role. The problem is that some suitable abilities has Bard somehow. Never mind, I invented new.
Primary weapon: spear
1) Scandalmonger of the Lake town - (increase her sight for 20 seconds by 40 % and reveals hidden enemy)
1) The herbalist from the Lake town (self healing little bit)
1) Quarrelsome woman - she argues to enemy hero her opinions (enemy hero is slower and has weaker armor by 20% for 30 seconds) - useful against another scout heroes
3) Throw a flowerpot (which causes injury to single target)
7) Brave lady from the Lake town - (Hilda summons old men and women into the battle)
We can use old design for Rohan units:
because in 4.0 Rohan units have completely new design.
Overall you can see that she has little bit "hero-killer aspect" but I would say that "counter-scout" aspect
So I hope that everyone loves Hilda, because she is really badass.