Here's some events you might wanna do if you haven't already!
Kira/Manticore relationship path
Location: mountain
reward: unique perk, and girlfriend :3
Vili's friendship path
Location: Imp den, forest dungeon
Reward: unique perk, and friend
Venefica pet/master relationship path
Location: Bon Bon Bun, forest
Unlock conditions: interacting with Lucy after beating will temple and obtaining the true will/power gem from beating both oni siblings.
Reward: secret dialog choices after dark petua fight with the voltin security investigator, and another with Ushris in the Labyrinth, unique umbral items and the ability to fight her at many varying levels of power, love-bar consumable and a new master ;] oh also a secret perk that is only obtainable by spending Obscene amounts of money on her..special offers causing you to become addicted.
Mara's.. stud/student relationship path?
Location: Vivian's bar and brothel night time
Rewards: Choice between two complete opposite unique perks.
I'll add more if I can remember them :]