It’s definitely worth to gather all of the below NPC.
Katriona(Old Owl Well) - You must have Casavir on your team to talk to her.
Jacoby(Fort Locke) - Same as Edario, but he upgrades the armor.
Deekin(Merchant Quarter) - this kobold will gladly open a shop in your Keep.
Uncus- He’ll join you automatically when you take over the Keep.
If you’ve worked with Axle before, he’ll be supervising your connections with Shadow Thieves.
If not, he’ll just be a merchant.
Torio- You great adversary can actually become a formidable ally if you decide to let her live.
Kana will tell you about that after a few initial rounds of keep-management.
The first encounter is on Bonegnasher Approach, then Githyanki Approach, and finally Ember in Act II.
ACT III
Bevil- He’ll be waiting near the gate of the Keep at the beginning of Act III.
It’s best to assign him to patrols.
Joy- She’s a dancer and can be found near the Blacklake gates in the Merchant Quarter.
You just have to convince her to work in your inn.
Caelryna- She’s the giants' prisoner at the top of Mt Galardrym.
She’ll open a shop with rogue-oriented stuff in it.
Light of Hope- you first meet her in Merchant Quarter, near Axle’s mansion.
She’ll challenge you for a duel.
Accept the challenge and defeat her.
Next you’ll meet her in Port Llast, near the merchants in the northern part of the town.
You’ll have to duel her once again.
The final duel will take place near the Keep’s main gate.
It’s best to assign her to recruit new Greycloaks.
Jalboun- You’ll meet him during the Sydney Natale ambush.
If you pay him well enough, he will switch sides and join you.
Assign him to perform special missions.
Mephasm- He’s Ammon’s former prisoner and can appear in the Keep to trade a little with you.
Jerro should tell you that you ought to be careful with this kind of stuff.
Talk to him to find out that you might actually summon the cynical devil.
You also must have a feat called Craft Wondrous Item.

Also, keep in mind that you have to be Evil or Neutral to barter with Mephasm.
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