This will be a thread for my additions to Carrion Crown. Feel free to steal from these or provide advice as you see fit.
Some of them will come from other posters and I will do my best to provide credit when I borrow ideas.
Players stay out! Especially mine.
First of all, I will be providing information on and a connection to Key NPCs based on traits. This will be supplied to the character who takes the trait as a secret.
Chance Savior: You saved the late Professor from certain death. In thanks, you were invited back to his home for a dinner with his daughter, Kendra, and himself. Kendra thanked you profusely after hearing of your deeds. You also gain a +2 bonus on all Bluff and Diplomacy skill checks made agaisnt Kendra.
Outside of this, characters taking this trait will be approached by Kendra first for being pallbearers and when information from the journal is found. There will also be the chance for romance with Kendra through this trait.
Subject of Study: As a part of your interviews with the late Professor, you revealed to him that you were exposed to malevolent spirits. He rushed away to fetch Father Grimburrow, an old friend of his who he trusted implicitly for his discretion. The elderly man took an instant liking to you and has offered his help should ever you need it again. You will not be charged for healing from the father and all purchases from Ravengro's Chapel will come with a 10% discount when purchased through you.
Outside of this, Father Grimburrow will offer characters taking this trait free access to the chapel's library and will ask characters taking this trait to provide eulogies for the late Professor before other members of the party.
Inspired by Greatness: Following in the footsteps of your scholarly idol, you spoke to one of his confidantes, Judge Embreth Daramid of Lepidstat. Judge Daramid was impressed by your enthusiasm in following in the professors footsteps and told you of many of his endeavors. When dealing with Judge Daramid, you gain a +3 to diplomacy checks.
Outside of this, Judge Daramid will reach out to characters with this trait first to act as a representative for The Beast of Lepidstat in Trial of the Beast. Daramid will also pull strings to assist in the investigation to speed up processes for legally entering places like Vorkstag's and Grines.
Making Good on Promises: The favor that Lorrimor did for you required the Professor to pull some strings for you and that involved getting Alpon Caromarc's assistance. You met Caromarc briefly, though he too seemed the type to remember debts owed. When dealing with Caromarc, you have a +2 bonus on diplomacy checks, but a -2 penalty on bluff checks.
Outside of this, Caromarc will consider the debt more than repaid by characters with this trait when rescued and will see that the characters are also rewarded personally. He will also provide information on controlling the Beast to combat the Promethean.
On the Payroll: During your time working for the Professor, you spent some time in the Shudderwood where you stayed at Ascanor Lodge. During your time there, you often met with a Harrower and courtesan named Madame Ivanja who regularly offered to perform a Harrowing for you as well as more carnal services. You accepted the offers (in line with your characters wishes) and formed a friendship with her. You gain a +2 bonus on diplomacy checks with Madame Ivanja and a 10% discount on her services.
Outside of this, Madame Ivanja will approach characters with this trait to find out if they will partake in either of her offered services. She will also provide a chance for foreshadowing future plots through Harrow for the characters with this trait. Madame Ivanja could also provide a potential romantic interest for characters with this trait.
Teacher's Pet: In your desire to learn as much from the Professor as possible, you regularly followed him throughout the lands relying on your parents to fund your travels. Soon, another benefactor arrived in the form of a fellow scholar who sought out the late Professors lessons, Adivion Adrissant. You formed a healthy rivalry-based friendship with Adivion fueled by your desires to prove yourselves as scholars. You gain a +2 on Bluff, Intimidate and Sense Motive checks when dealing with Adivion.
Outside of this, characters with this trait will be the primary recipients of letters (as suggested by Loki_Thief) to the party and will also be the last to be targeted by Adivion's followers, but the first to be targetted by Adivion himself. Adivion will often taunt characters with this trait directly and will make mention of them specifically in his Big Bad speech.
I am also reworking the Paladin's Immunity to Fear as a +4 morale bonus versus haunts to prevent the "The Paladin walks in first, spends a couple of minutes walking around then the rest of the party follows" mindset.
This is it for now. I will be creating a conversion for 6 players and alternative locations for crucial items based on the presence of a Paladin in the party.