First pass suggestion for splitting NPCs.
a) PCs form their own squad.
b) Two Centuries formed into squads of 10.
c) Century A has 11 squads, Century B has 10 squads
All (A) squads have 1 each barbarian, bard, cleric, fighter, monk, paladin, ranger, rouge, sorcerer, wizard
Century B, Squad 1-3: 1 each barbarian, bard, cleric, druid, fighter, monk, paladin, ranger, sorcerer, wizard
Century B Squad 4-6: 1 each barbarian, cleric, druid, monk, paladin, ranger, sorcerer, wizard; 2 off fighter.
Century B Squad 7: 1 each barbarian, cleric, monk, ranger, sorcerer, wizard; 2 each druid, fighter.
Century B Squad 8: 1 each barbarian, cleric, monk, sorcerer, wizard; 2 off druid; 3 off fighter.
Century B Squad 9: 1 each barbarian, cleric, sorcerer, wizard; 2 off druid; 4 off fighter.
Century B Squad 10: 1 each barbarian, cleric; 2 each druid, wizard; 4 off fighter.
Probably needs some tweaking but its a start and no, I am not going to name them.