Vladco Heiress au is constantly on loop in my head so here my ideas for the other DP characters:
Jazz - researcher psychologist with a focus on socio-cultural psychology. After Danny manages to come to a compromise with his rouges, creating a long-term truce, she becomes interested in cultural differences between Realm beings and Amity Parkers & later on how the two cultures started to blend and form unique social norms.
Tucker - didn’t go to college and just started immediately working at Vladco as Danny's assistant/advisor to help him out while he figured out how to run the company. Once Danny started getting things under control Tucker became an engineer (still at Vladco) to focus on his inventions.
Sam - she properly sat down with her parents and talked to them leading to them realizing they have been acting unreasonably and compromising. Her dad offers to teach her and Danny both business and how to lead a company as an olive branch. I imagine her family has a successful telecommunication company but for now her dad is running the company so Sam can start her own company which creates and researches eco-friendly solutions (e.g biodegradable plastics) while working with a bunch of eco charities.
Valerie - in my au she joins the Phantom team during 50 Shades Of Valerie Grey. The team has trouble trusting her at first but eventually they become close friends. I imagine that she took some odd jobs after high school trying to support her dad and then ended up with a security job she enjoyed. Once Ellie started traveling Danny hired her to act as Ellie's bodyguard because she's the only person he could trust keep Ellie safe. Whenever she's back in Amity she meets up with Danny and Tucker to have geek out sessions where they create ridiculous technology while not sleeping for 3 days.
Wes - became part of Team Phantom after Val but before the release of Pariah Dark. Became an investigative journalist so he travels a lot - this and his tendency to hyper fixate on his articles means that he's horrible at keeping in touch with people. He's closest with Valerie (she was the first one to properly accept him onto the team) and Ellie (they meet up whenever they are in same city and compare notes about rich people - Wes tells her which CEO's he thinks are doing shady shit and she tells him which rich people gave her bad vibes or are assholes).