Nefaro just ninjaed me (pun intended) of the suggestion about rivalries.
Some random ideas about narrative and immersive events, from my limited knowledge of Japanese folklore, could be rooted from the perception of supernatural:
-Someone is suspected of being a Fox in disguise (or similar shady rumors about his/her nocturnal activities)
-New Holy Shrines dedicated to local Kami could be built, or not, but there is the request
-Christian guys get a fame of being devilish creature but get followers (Tokisada Shirou Amakusa?)
-Peasants rumors of Oni showing up on rice fields (or on the sea) at night
(more could come from a learned historian of Japanese folklore)
Other events could be interesting and be chained into 'trees', the direction to be chosen and however never having a net gain or loss.
'Forbidden Love' tree:
-Can strike only berothed characters being 13+ years old.
-The character can choose to shun his feelings or defy his family
a) Try to sever the connection with the forbidden love (add trait 'Driven by duties': -1 Intrigue, +0.05 Honor/month,)
b) Keep seeing her secretly (add trait 'Driven by feelings': +1 Intrigue, -0.05 Honor/month)
After reaching adulthood and marrying, the former love is seen once again, and the following event happens:
If you chose a):
a1) "I have already chosen to follow my duties as a faithful husband" (+5 Honor, triggering future events)
a2) "I knew I could not stay away from you..." (lose trait 'Driven by duties', gain trait 'Unfaithful': -0.02 Honor/month, -25 relations with your wives, triggering future events)
If you chose b):
b1) "I love you like the first day we met, no one will stand between us..." (gain trait 'Cheater': -1 Diplomacy, -10 relations with your wives, triggering future events)
b2) "To tell the truth, I have learned love is not forever..." (lose trait 'Driven by feelings', gain trait 'Shunned Love': +10 relations with your wives, triggering future events)
After this, the character has 1 of the following traits: Driven by duties, Unfaithful, Cheater, or Shunned Love.
The following events can happen later:
Driven by duties:
-low chance that your former love will return to haunt you with doubts (add trait 'Lovesick': -1 Military)
-medium chance your Clan will know you for the dedicated man you are (+3 honor)
Unfaithful:
-high chance that one of your spouses will try to expose you to the clan (chances of success high if your Intrigue is low and vice versa, if successful gain the trait 'Exposed' : -1 Diplomacy, if not successful gain the trait 'Hidden': +1 Diplomacy)
-low chance that one of your spouses will flee not to be seen again (medium chance if the character is 'Hidden', spouse dies)
Cheater:
-low chance that one of your spouses will try to expose you to the clan (chances of success high if your Intrigue is low and vice versa, if successful gain the trait 'Exposed' : -1 Diplomacy, if not successful gain the trait 'Hidden': +1 Diplomacy)
-medium chance you find that your arrangements give you a happier life and someone out your family supporting you (+5 Gold)
Shunned Love:
-medium chance that your former love will want to avenge her broken heart (chances of success high if your Diplomacy is low and vice versa, if successful lose 5 Honor, if not successful gain 5 Honor, event can repeat itself)
-medium chance you'll get the chance to get rid of your former love interest -bribes, forced retirement, homicide-: You can spend 5 Gold to stop the Shunned Love events, or just do nothing.
That means you can roleplay, but if you want to cheat others you better have a high Intrigue or it is not good for you, while being honest can bring Honor if you have good Diplomacy.
I have to go, will post more in the future.