Just getting into the module myself, 2 sessions behind and there are a lots of NPCs. This helps me by getting a quick overlook over the main characters and their relations.
One NPC who is very loved by the community that I didn't find is the Black Viper / Esvele, who is also a good acquaintance of Renaer Neverember. Even though she doesn't have a huge plot significance, I would add her due to her being a very interesting character who adds a lot to the story if you run her.
Also for someone (me) who hasn't read all of the module yet, there's one odd place with arrows on the leftish mid-range of the npc map. We have an arrow going from Jarlaxle to
- escapes on (submarine)
- lovers (are both the acrobat and the lyrist his lovers? or are they each others lovers?)
- infiltrates party, arrow going to the Harper's Haventree/Overseer
Arrow nr. 2 question is quite clear, I guess I'd figure it out by reading the book, but why is the arrow of infiltrating the party going to the Harper's Overseer?
Nothing else that I got especially confused by for now, but it might be less confusing if I was 100% familiar with the material.
E: Thanks for the answer! As I said, I'm not 100% familiar with the material yet, so the NPC map was right, I was just surprised by some of the connections :D
Also I think the Black Viper probably is more featured in the faction quests which you have omitted for space, so no wonder I had a bit trouble finding her.
E2: Reddit is where I come from :p
[5 of 5 Stars!]