Empowered troops: Brown/Yellow has three, Purple/Green has two. No others have more than one.
One-Shot troops: all three are Yellow.
Legendary colors: Brown/Purple has four, Blue/Yellow has three, Blue/Purple has three. Many others only have one.
Female troops: Karakoth, Khaziel, Sword’s Edge and Zaejin are the only kingdoms that don’t have at least one. (Primal and Apocalypse don’t really count…)
Only seven of the kingdoms’ emblems do not have a face (or skull) of some kind.
Khaziel, Maugrim Woods, Pridelands, Wild Plains - their emblems do not accurately represent their kingdom’s banner colors. The rest mostly do (some blurring of the lines here, i.e. Zaejin maybe and so on…)
Although the Imps have similar legendary trait, only Shadow Dragon has a trait allowing him to gain attack for every gem match of a specific color (purple).
Glacial Peaks, Drifting Sands and Blighted Lands are the only three Kingdoms having no deck slots associated to them.
Although it is not represented on the map, the Primal kingdom actually has a location ; coordinates corresponding to where it should be on the map (that is in the sea in the bottom right corner of the map). I used that to place it on my unpublished site and wonder if Apocalypse is the same (wich would be convenient for me !)
The hero used to have his own Kingdom, it’s still in the game file (as many obsolete resources) but it’s not used anymore.
To be fair though, you can’t throw the dirt eating scum of Broken Spire in the same pot with the highly sophisticated Titans of Stormheim! Well except Ogre, he’s ok, he tells great stories.