Darcy Lewis (Thor)

I'm following the same backstory I gave her in the early 2010s,and her age may change depending on the thread, but she's 30+ by now and while she's met many milestones career-wise her personal life is very chaotic.
Ship-wise, since she's written around characters who basically live forever or age slowly, if a ship happens I want her to somehow gain some regenerative power that will give her a super long life too. I cannot stand the pain of ships where one ages super fast. That and it's easy to do it for Darcy since she's now basically alone in the world and won't have to survive loved ones that way.

option A, default UNLESS you tell me you'd rather have B because A is triggering: raised by an emotionally, verbally, and at rare times physically, abusive mother, and her many boyfriends, Darcy started working as soon as she could to put aside money so she could leave. She always had a great relationship with her grandmother. Darcy managed to get good grades because ridiculously smart (we see her display hacking skills, and she easily switches from a political science major to getting a doctorate in astrophysics of all things, in the span of a few years).
Despite this, due to her upbringing and her naturally carefree attitude often seen as a sign of immaturity, she's often been called stupid and has interiorized it quite a bit, the typical 'I only succeeded because what I had to do was easy' way to see things.  
As an adult, she's STILL paying for her mother's everything (because "she's still my mom, what am I gonna do, get her arrested?"), and also repaying student loans (though she did get partial scholarships), so despite doing well-paid jobs she's poor-poor. Shitty apartment in a dangerous neighborhood, little side-jobs, and so on. Always been that way, hence having a trusted taser at all times.

option B (skip if A works), everything is like the above except that her grandmother took her in, and it's only several years later that her grandma's health deteriorated and Darcy started working to pay for her care, the house and everything she needed. While her mother is less in her life here, having been basically ditched at such a young age has still left a mark on Darcy. Living in extreme poverty and having to deal with all kinds of consequences of it also did. Same poor-poor situation as before while her grandma is in a very nice retirement home, same lack of confidence in her skills but she's faking it until she makes it. She doesn't easily accept help but she's always ready to lend a hand. 

No matter which option you choose: Darcy is CHILL. That's the first, most important trait: she's not going to be particularly shaken by anything because of all the things she went through and she simply accepted Thor existence before the public knew aliens were a thing. The only thing that impresses her are muscles, as seen in Thor. She's probably cracking jokes here and there about stuff that traumatized her too. However, once Jane dies, Darcy will retreat even more behind her 'dude, chill' persona because the pain is just too much.
She may find it embarrassing to give emotional speeches, but when she cares, she cares. Jane and Erik were her found family for years, and she stuck by Jane until the end. In her head, Thor is a part of that, he is a part of having found her family in New Mexico. That's a forever bond to her. She's also very non-judgy so she can interact with basically anyone who isn't trying to kill her. 

If we follow canon-ish, it'll be nice/fun to have her meet other Avengers through Thor, but she'll also be there for Thor himself during the 5 years of the snap, as much as I hate that storyline and would love to skip it (but I know we can't, too many shows are based on Endgame and people having disappeared for 5 years).
If we don't follow canon and you want to pull an 'avengers were friends all along, living together, still are' we can let her work with them/for them as a researcher on top of her other jobs.
Also: she's obviously not going to publicize her personal misfortunes, current lack of money (embarrassing! but she's stealing extra food from the work kitchen) and life-sucking mother (or at least, she won't mention that her mother is still making her money disappear, she'll only mention their messed up past if she can joke about it).