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This is just my IMHO, but I wouldn't want Barbarians in the style of HoMM3 (I mean with a Mages Guild only up to level 3), and in the style of HoMM4 they simply cannot exist (everything there relied on the hero, who handled everything themselves), well, and Barbarians with full-fledged magic aren't really Barbarians anymore :) .
But who I would want are dwarves in the style of the Mountain Clans from Disciples (with a Valkyrie at level 7 that flies and hits everyone around :cool: ) and :
a composite race from Greek mythology (since the word HERO itself comes from there, but now only hydras and minotaurs have been left) . It could be called, for example, ATLANTIS . You could include CENTAURS, HARPIES, MEDUSAS, SIRENS, CYCLOPES, LAMIAE, and the ATLANTEANS themselves :) as the 7th level.