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This is just my IMHO, but I wouldn't want Barbarians in the style of the third installment (I mean the guild of mages, only up to level 3), and in the style of the fourth installment, they simply couldn't exist (everything there depended on the hero who could handle everything himself). Well, and Barbarians with full-fledged magic are no longer quite Barbarians.
But I would like to see Dwarves in the style of Mountain Clans from Disciples (with a flying Valkyrie that beats everyone around at level 7:cool:) and:
a mixed race from Greek mythology (because the very word HERO comes from there, and now only Hydras and Minotaurs remain). You could call it, for example, ATLANTIS. You could include CENTAURS, HARPIES, MEDUSAS, SIRENS, CYCLOPS, LAMIAS, and the ATLANTANS themselves as the 7th level.
Sorry for the self-promotion, but how do you like the castle a little higher up? I also took into account the racial approach there – I used Fauns/Satyrs as a basis.
By the way, as soon as I get a modem at home, I promise to provide descriptions of other castles from the list above!