Your Main is currently living with you.
What do you do to make them feel more comfortable, and or not piss them off?
I would make no mention of her past (She'll tell me about it when she's ready.) And make sure her bed has been scrubbed clean from the sheet's, to the mattress, to the pillows before she arrived so she can enjoy sleeping in a real (And clean) bed again rather then whatever shtty bedroll she's been sleeping on.
Make sure her room is covered in everything that could possibly be J4 related, and ALSO never make a mention of her past, and to also never complain should she ever turn into a dragon while inside the house. I would also say that I find her much more attractive the Quinn and that there is no way Jarvan would ever choose Quinn over her.
I'm Ok with this
My place is loud as hell and I can never sleep, on the plus side there is enough booze and groupie girls around during band-related events that I don't need to bother trying to get into a serious relationship.
!!!! I told you, you can convert YOUR room into a shrine for the void, BUT LEAVE THE REST OF THE HOUSE ALONE!!!
Here's the oven, have fun.
: We'd both rarely be home so I don't think there would be an issue.
A transparent ceiling is a must during the day.
(Belly rubs and chocolate!)
Money so he can continue running his fleshling compatibility services, and perhaps a good wash now and then.
"Teen boy things"
I dunno, peace or something?
We both have good senses of justice, so we'd get along.
Wolf: The privilege to chase my cats around, so long as he doesn't kill them...
Lamb: A target in the backyard, a bunch of apples, and perhaps a friendship?
Rock polish.
Ninja stuff.
I dunno what this guy'd want, to be stonger? So... a gym access pass?
Bananas of varying kinds, and also glow-in-the-dark sticky-stars you can stick and peel off anywhere. I have those, they're real soothing...
A 
new set of kitchen knives.
And my hoard of varying weapons in my attic.
No.
A whooooole lot of new explosives, and maybe a couple of other yordley stuff, like sweets.
My old poker deck that has animals instead of symbols.
A klein bottle. Oh, and maybe a video game where you can level infinitely.
Oh, and maybe a new wand.
Definitly not my bod. Or my cats.
Perhaps a dictionary!
His own lab.
Keep the AC on and make sure to wear a coat.
Graggy Ice
will be having sex all night. Because she left garen and needs a new Fuck buddy. Her room is full of blades and whips
me with the power of a magical rock monkey that can create decoys in my corner...
The whole house smells of oranges and nobody else can sleep at night because he's always plotting to try and retake Bilgewater. It's tempting to help him just to get him out of the house
"For the last damn time, no I will not play BeyBlades with you"
HOW DO YOU EVEN FIT??
Gonna need a new tank for the shark...
If I run out of toilet paper I gotta get a new house
- is he even going to stay for long? he has a country to run away from.
-i'm way too lazy to think of anything
- i'm way too lazy to think of anything
- defense from the void arts. all day.
I can't eat this, 
is still mooing, at least cook him first!
Really got nothing for this one. Probably just tell her that everyone knows shes the stronger and cuter one.
: Well I got my own Tibbers so TEA PARTY TIME :D
Fridge stocked with purple Faygo.
"Sorry, I left the fuzzy cuffs at home"
: Cecil looks like somebody very likeable, even if his gratuitous application of SCIENCE might prove problematic with noises and eventual side effects, like a laser-throwing TV or a missile dishwasher. I'd probably make sure to set up a workshop outside of the main house, maybe in the garden, and blast-proof his chamber.
I say to her how much i love Ionia and that Noxus sucks and must be destroyed, will ask her to teach me how to use her blades too.
skylight water daily and NEVER EVER step on any flowers also ill make compost for her out of my trash
let her do her thang she'll prob just meditae in zyras room and make some tea