1. More NPC to player interaction.
Have Kingdoms offer you to be a vassal for them, based of good relations and clan tier.
Also have Lords offer marriage proposals both to you and your family members, also based off relation and clan tier.
Have enemy lords threaten player, I could elaborate more on this, but best saved for another thread.
2. Have relations and traits mean more.
So glad to see that enemy lords with high relation will raid your villages less, but also add, releasing player after losing a battle, high relation and honourable lord leaving you alone when you are a party of 1. Send you small gifts occasionally.
Honourable and Merciful lords raid less, disapprove of player raiding. Valorous Lords approve of outstanding victories, disapprove of you abandoning troops. Separate relations to individuals rather then the whole clan.
(Taleworlds please implement True Relations mod into the game basically)
3. More dialogue
This doesn't need a long description its pretty much self explanatory