Well, I;'d look at CYl2 (not 3) as a good baseline for this. Now, let's see who the top, not ingame units, are, shall we?
Idunn, Rutger, Lugh, Dieck Gonzalez, Lot and Sue.
Now, from these units, I assuredly expect Dieck and Rutger, and Lugh is a shoe in because of Raigh. Now, for the 4th unit, my guess is going to be Sue. Why Sue you may ask? Well, Lugh can be a blue mage, Dieck can wield axes, and Rutger can obviously be a myrmidon. but Sue can fill the colorless archer niche we've been missing (at least, for the regular pool that isn't B!Lyn)
Now, for the GHB, I feel that Idunn could be a shoe in, however, I'm willing to bet something along the lines of a friendly hero. And that, is anybodies guess.