On the royal household, I was thinking as I was playing Medieval II that the idea implemented in that game of royals having retinues might make sense in CK2. Someone already brought up the idea of retinues in the sense of providing factions or personal retainers for each prestigious character, but I think that perhaps there should be events to add non-noble characters that would not be represented by actual characters but rather modifiers represented by icons like the personal flags in EU Rome (which were distinct from traits). I am offering a few examples, please let me know what you think. I don't even know if such things are able to be implemented, but it should add some color to court life. I wouldn't want this to get excessive, but I was thinking of things like:
-Troubadour/bard/jongleur troop: A traveling songsinger of some renown has arrived in your court. If you give him patronage, +prestige to you, + small relation bonus to people in your court (life at court was boring, you hired someone to perform regularly to liven things up a bit); of course he will be on his way, so it is a temporary gig, but maybe you or one of your children can learn the craft for a bonus trait (I'm thinking of William IX of Aquitaine here).
-Lover: goes for males or females, you are reputed to have a secret or not so secret affair with a commoner, maybe a member of the staff
-Physician: you keep a physician (likely of Jewish or Muslim origin) in your employ; could sour relations with the Papacy (historically, the Pope did not want non-Christians treating Christians), but you could also get events for people in your own court or your neighbors or relations to be cured of some malady (including blindness or fevers) by this physician
-Hermit/friar/Sufi mystic/gnostic/pagan wizard (a Merlin-type): you have close relations with an unorthodox religious specialist, maybe Christian, maybe not, who has been known to have gained more influence over your thinking or way of life than your bishop thinks healthy for your soul, or his career. Your other courtiers may be intrigued, think you bewitched, or be put off.
-Favorite servant or slave: You favor a non-noble in your personal matters, maybe someone you grew up with or one of the few people that you think you can trust with matters of discretion. Noble favorites should be fully characters, but you could promote your unequal friend to noble status by event, much to the scandal of the court...