So the conclusion I should take is then that Lor/Sha Kithkins aren't actually Kithkins, because they aren't like Hobbits, and being like Hobbits is a part of the Kithkin core identity?
I'd argue that they are kithkins, but Brady was ultimately arguing for brand identity... because the Lor/Moor kithkin have a LOT of Hobbit traits despite his protestation that they don't.
Hell, one of the crucial scenes of Morningtide was Brigid ruining a plan specifically
because she inappropriately burst into song!
The community orientation was also basically the Shire itself, with things that are 'different' being shunned. That was a tremendous part of the Shadowmoor identity, in fact.
About the only triat the Lorwyn Kithkin demonstrate that is at odds with Hobbits is a fondness for heroics instead of the quiet life.
Despite being the only magic books I have copies of, all of Lor/Sha is such a blur to me that I remember nothing but rough outlines.
A lot of the heroic nature of Kithkin probably comes in large parts because Lorwyn is a block about tribal warfare, and you can't have a tribe of creatures that don't participate. I do think they have a craftiness that exceeds Hobbits though, and their alchemical mysticism approach is quite neat.
I don't have the impression of Lorwyn Kithkin as notably xenophobic, they seem relatively friendly given the environments. Certainly in comparison to Elves, but they're also the top end of that spectrum. The Shadowmoor ones, on the other hand, have a paranoia to the point of perpetual anxiety that clashes with the more easy-going nature of Hobbits (although that might change if they were in the same circumstances.)
Regardless, the question was regarding the inclusion of Kithkin on other planes. What are the pillars of kithkinhood? Are they just midgets that could be any combination of colors, or do they have a dominant white trait?
Which also makes me wonder, are there any planeswalkers (or legendary creatures) that aren't of their race's dominant color?