Bandit Lord:
The sovereign starts with 2 bandits > The sovereign should be able to call for help once per battle and summon 3 bandit archers with shortbows at level 1 - 4, 5 bandit archers with longbows at level 5 - 8 and 7 bandit archers with yew longbows at level 9+.
Works for me. Maybe costs 20 mana?
Summoner:
+ 2 level for summons and unlocks the summon warg spell > It should increase the level for summons by (level of the sovereign / 2) and the summon warg spell should be a standard death spell.
Summoner is already a very viable pick in both early and late game. Needs no adjustment IMO.
General:
+ 3 to armies accuracy > Armies should get a XP bonus of 25 %.
How about the Sovereign starts with the Trainer I trait? It's 10% for him and the whole army, ramps up to 30% as he levels it.
Merchant:
+ 3 gildar per season and - 20 % to unit wages > The sovereign should be able to sell items for the buying price.
Uhh, NO! A huge RESOUNDING NO!!! We already make TONS O MONEY selling at a huge loss vs. the buy price. Any more is not needed. Besides, this is already a good trait, giving extremely needed early and mid game money, while saving you a bundle on late game army maintenance. This trait is fine as is.
Assassin:
+ 3 to critical chance and + 50 % to critical damage > Melee and ranged attacks should inflict (level of the sovereign) poison damage per turn.
I could get on board for this. Something unique without getting ridiculous. plus lots of stuff is immune to poison as a balancer.
Diplomat:
+ 30 % to trade value > The sovereign should be able to recruit champions of the other faction (kingdom > empire, empire > kingdom), too.
Right now diplomacy is not a very big deal in the game. I am hoping it becomes more useful.
Warlock:
+ 50 % spell damage > It should increase the spell damage by 25 %.
I'm on board for nerfing this one some.
Hunter:
+ 25 % attack against beasts > It should increase the attack by 25 % against non-humanoids (beasts, elementals, dragons, ...).
Right now Hunter is pretty useless, broadening the targets could be one way to make it better. Another one would be giving some bonus to movement, such as a pair of +1 move boots for the Sov.
Scholar:
+ 2 Research per season and + 2 intelligence > It should increase the research bonus of buildings by 50 %.
My suggestion is +1 research per season per Sovereign level.
Warlord:
The sovereign gets 10 % of the champions XP > It should reduce the unit wages by 25 %.
How about +1 STR/CON for all units?