Hi hello! 5 and 7 for Moira, 4 and 9 for Alex? 13 for whoever you wanna talk about c:
5 - Has their vampirism cost them friends or forged new bonds?
In Moira's case the vampirism has almost exclusively allowed her to forge new bonds. Especially given she made the decision to wait half a decade after the Vamp!house settled in to actually make the change.
She had cut ties with a lot of people immediately before moving to Chicago, so there weren't a lot of friends left to lose, and the ones who she did were more... colleagues than anything else.
Moira is the one who befriends the DA's assistant, Theo when he starts working for Davies' office in...oh that would be about 2002? She does art trades back and forth with them, and they sometimes collaborate on projects for local events.
Obviously she is very much closely tied up with the rest of the vamp!house. She, Jesse, and Daniel would pretty much all die for one another if it came down to it. This includes Alex down the line when they eventually become part of that family.
7 - Are they open about what they are, or do they hide their condition?
Moira is one of the members of the vamp!house who will drop the world's vaguest hints about the truth, but won't actually say anything that puts the household in danger.
She's the one every other day going "I don't care if it's not real food, I'm making quesadillas and salsa." and then not elaborating if/when someone brings up that that is in fact, real food.
The one who is up at 10AM in the goddamn morning, wrapped in her silly little blanket cocoon, trying to shimmy the kettle out of the sink because she forgot it there again even though she knows the sun is coming through the kitchen windows at just the right angle to bounce off the copper at that hour of the morning.
The one who when Isaac is brought over to help Alex is kinda just sitting in the room with him and he very quietly goes "Are you... all--?" and then stops and she first assumes he's asking if they're all okay, since that was the first thing she asked him. But once it's clear that's not what he meant she goes "Oh--all vampire, yep, sorry." and immediately goes back to drawing even though she's got blood halfway up her arms because it's been a gross night and she needs to decompress goddamnit.
4 - How does being a vampire affect their interactions and relationships with other people?
On the whole I would say poorly.
Given uhhhh, let's see in a single month alone they nearly kill Isaac three separate times, makes them conflicted about their housemates (murderers), they get kidnapped by one of said housemates old friends-turned-worst-enemies (because they refuse to commit murder), eventually it leads to the death of their parents (this is a good thing), ends up getting them staked by a friend (it was an accident) and by Isaac's uncle (that one was on purpose).
Alex is jumpy, Alex is not super duper in control of their newfound supernatural bullshit, Alex would very much like to not have to be thinking about how much the people they are trying to be friends with smell like a really tasty snack right about now--but it's fine, they're fine, they're not gonna hurt anyone--
It gets, better after they turn all the way, but it's still, a little on the far side of complicated for their liking.
9 - How do they get their meals?
By using Isaac as a juice box
Some of the time. A lot of the time.
When Alex does kill people, it's almost entirely reserved for anyone who tries to hurt them. Do they put themselves in dangerous situations sometimes to achieve this--yeah, yeah they do--but the knowledge that it's them being attacked first helps them justify it, and it stops Isaac from trying to literally bleed himself dry, which is their Other Concern.
13 - What inspired their design?
I wanted Eden to feel a little more otherworldly, like Amalthea but less unsettling and more ethereal. Still very apparent that she's not human, but not... in a threatening way. More in a what am I looking at kind of way than a Oh God What Is That Thing Pretending to Be a Woman which is what tends to happen when someone witnesses Thea for the first time.
Like Amalthea, Eden is old enough to be fully unsaturated (someday I'll find better words for that, not tonight, it's almost midnight), and her body isn't really... all the way there anymore. Daniel describes it as looking at someone through frost, like the light is bending around her in ways you don't expect. Where Amalthea is stone made moveable, Eden is Smoke made Solid. Like she's matter poured into a cracked vessel and it can't help but pour out.
In so much as the way when my vampires disappear, they sort of melt into the shadows, Eden is always partways into that space, always a little faded into the background. Which suits her well enough, she likes to be ignored, she likes the safety of being considered inconsequential, and she likes to see the terror on people's faces when they realize she isn't.