I started shipping Julie/Edythe but also Julie/Edythe/Bella, so have some headcanons I made (also with some pics I made with a picrew)
Julie (I love her so she goes first)
Full name is Juliet Black, so Julie stays as the shortened nickname (I hate how "Jules" sounds). Edythe (and her siblings) call her mutt or lapdog (as she won't leave Bella alone), but eventually changes to using "pup" in an endearing way until Julie snapped for being treated like a dog. When they get into a situationship though, Edythe lets the occasional "babygirl" slip out
She's 17 and phases at 18, Bella is 1 year older and she's in college with the Cullens while Julie is doing her last year in hs
She's the tallest of the three of them at 1,85cm (after phasing out), she used to be the shortest before phasing out.
She's bisexual, but that's between her and her future partner(s). She doesn't like discussing it with other people
She slowly grows a big crush on Bella, at first she was a little irritated with her though with how naive and clumsy Bella is
While Julie agrees Edythe is attractive (by textbook definition), she doesn't understand what Bella sees in her to be so head over heels for her. She doesn't seem that interesting beyond looks to Julie
After phasing out, Julie tries to seduce Bella by wearing more revealing clothes (crop tops, very short shorts), she eventually finds out that Bella seems more interested in her when she wears cute femme outfits
When it comes to style, Julie is the most femme out of the 3 of them (which says a lot about the other 2), though she was more gnc before phasing out as she felt awkward in her skin (phasing out made her feel more confident about her body)
When Julie starts college, she basically invites herself into Bella and Edythe's space. Bella doesn't mind much but Edythe definitely does, creating tension between the shifter and the vampire
Julie starts to get interested in Edythe when they find some common interests (which was very, very hard to do). Bella encourages them to spend time together
(If there's something I like about official art Jacob is the soft look in his eyes, so I think she will have that too)
Edythe
Her siblings call her Eddy, Bella uses her first name (she would use "babe" on rare occasions though), Julie calls her cold one/leech but then changes to "pretty girl" (although, in a mocking tone) when they're in better terms
Edythe is below average in height, but she's taller than Bella
Lesbian/demisexual, she finds out she likes girls when she meets Bella. She never figures out the demi part, which is the reason why she had stayed single and a virgin for 100 years
While it was Bella's smell and Edythe's inability to read her thoughts that got the vampire girl interested, it's not until they get to know more about each other that Edythe starts developing a crush on Bella. They start dating after Bella figures out the vampire stuff and wholeheartedly accepts Edythe as she is
When it comes to fashion, Edythe either goes femme or masc, she can do both. She also wears (fake) glasses to make herself look more "human", Emmett teases her about looking "too nerdy"
She often gets needy about having Bella's undivided attention. She loves every moment they get to be alone, which is not very often with Julie around
She tolerates Julie as she doesn't want to upset Bella, but she really can't stand the smell of a shifter. She does think that, with how cold her body is, a hug from the shifter would feel nice with her being warmer than the average person, Edythe would never admit that out loud though
When Bella can't go to classes and insists on Edythe going, she goes back to sitting with her siblings and completely ignores the lost "pup" that was hit with the realization that she needs more friends than Bella so she doesn't have to sit alone. If Edythe feels upset over Julie not sitting with them as often now that she made other friends, it's probably just her imagination
Bella
Edythe calls her by her name most of the time, might use the occasional playful "lil' lamb". Julie alternates between Bella and Bells
Shortest of the trio, there isn't that much difference between her and Edythe though. Julie does tower over both of them (Bella teases Edythe about being eye-level with Julie's chest, the vampire isn't very appreciative of such jokes)
Vampiresexual, no, seriously, anything to do with vampires is attractive to her. Otherwise, she's bi and ace (though not the sex-repulsed kind, it's just not important to her. A vampire bite does seem more sexy to Bella)
She's completely fascinated by Edythe, she is adamant that the vampire is nothing short of perfect, which is a bit of an issue when they get serious
While Bella admits she used Julie at first to get to know more vampires, she does like the girl, she seemed very sweet and kind. She did change a lot after phasing out and Bella isn't sure about her feelings towards the shifter, but they're mostly positive
She did get annoyed when Julie had started invading their space at first, but her little banters with Edythe were so entertaining Bella stopped minding
She thinks Edythe likes Julie and teases her a lot about it, Alice joins in sometimes but, unlike Bella, she doesn't believe that her sister could like a shifter like that
Bella is a little saddened to know the Cullens, except for Esme and Carlisle (and maybe Emmett too), wouldn't approve of Julie or any other shifter into their family. The same can be said about the Quileute tribe when it comes to vampires. However, she giggles to herself when she thinks about Edythe and Julie being like the supernatural Romeo and Juliet
Bella has a very butch-like sense of style, she probably would cut her hair too if it wasn't bc it's convenient to hide her smell from vampires at least a little bit, and Edythe likes to try new hairstyles on her. She has a tendency of getting hurt, so she's almost always patched up
She has a strong "I'm dead inside" look on her eyes, she looks very calm on the outside, even if that's not the case on the inside