[zepath]

An easy way of coming up with heroes is to think about the strata of society not represented in the normal recruitable commanders. If the "highest" commander available to a nation is the equivalent of a prince or a high priest, try making a "king" or an "angel" hero. You can also take normal elite units, trick them out with a sweet mount or special powers and *bam* instant hero. I also find myself thinking about movies I've seen that are related to the nation at hand and drawing heroes from the characters. Humor is also great for heroes if you can think of a fun champion.

How about some sort of mage or monster having to do with a solstice or equinox for Marverni?

Agartha could use an intelligent troglodyte knight.