I agree with @DonBoba proposal for the Anunbite Warrior.
Alastair: I would introduce a new trait previously proposed a while back ago. "Holy Armor - any dmg that would bypass armor gets redirected to armor". I know True Dmg and Armor Piercing aren't particularly powerful as of now but this new trait would make Alastair more of a tank in those situations.
Apothecary: she's fine as is.
Archon Statue: its use has fallen off quite a bit but it's still one of the better non-Guardian constructs. Maybe have its 'extra dmg if damaged' scale from its missing armor (think of a reverse Rowanne)? Have the boost ratio at 2:1 or 3:1 to prevent it from being too powerful.
Armored Boar: this is a pretty bad Common, perhaps give the spell an extra turn or 50% chance for extra turn.
Can we introduce new trait ideas in this thread? We should have a Trample style mechanic - if skull dmg should kill a troop, any excess dmg carries over to the next troop. Give Armored Boar Trample.
Astral Spirit: fine as is.
Atlanta: She really needs a rework, her AoE spell has really fallen behind the times! Either give her spell some increased dmg OR introduce some RNG. I would do "Rain of Arrows - Deal [Magic + 2] dmg to all enemies. 50% chance to cast spell a second time at no cost".