Doing this for Modern!Willabeth because, let’s be real, it’s a hell of a lot easier given the questions :)
Who’s more dominant: Elizabeth, hands down.
Who’s the cuddler: I honestly think they’re both cuddlers. The DMTNT post-credits scene basically all but confirmed this, seen as Will cuddles her but then she cuddles him back. So, he’s the initiator.
Who’s the big spoon/little spoon: Big spoon, Will. Little spoon, Lizzie. See above.
What’s their favorite non-sexual activity: They go fencing at least once a month, and honestly it’s kind of an aphrodisiac.
Who uses all the hot water: Will, because it takes him so fucking long to wash that hair even though Elizabeth’s is longer. She gets her own back by running hot baths in the evening and leaving him to take cold showers.
Most trivial thing they fight over: Whose turn it is to take Henry to school that morning, probably.
Who does most of the cleaning: They probably share this task, imo. He’s well organised, she’s a neat freak. Occasionally, they’ll let themselves fall into slob mode, but then they make up for it with some pretty deep spring cleaning.
What has a season pass on their dvr/Who controls the netflix queue: Elizabeth, because she has better taste (she assumes, and he lets her assume).
Who calls up the super/landlord when the heat’s not working: Will, after trying and failing to fix it himself.
Who leaves their stuff around: Neither, see above (except on occasion). Their combined office is a bloody mess though.
Who remembers to buy the milk: Will.
Who remembers anniversaries: Both.
Who cooks normally: Elizabeth, while he sets the table with Henry, and he does the dishes afterward.
How often do they fight: Verbally? At least twice a week about important things (because they’re married and they’re used to it). Physically, never unless it’s swordplay. Does sexy tickle-wrestling count?
What do they do when they’re away from each other: Call e/o every morning and night, text midway through the day to catch up. More or less often depending on the reason they’re apart.
Nicknames for each other: Liz, Will?
Who is more likely to pay for dinner: Joint account, but while they were still dating he insisted on it.
Who steals the covers at night: Elizabeth steals them from him, and then proceeds to kick them out to the bottom of the bed.
What would they get each other for gifts: She gets him a new watch every other year, and other things she thinks he might enjoy. He got her a charm bracelet for their fifth anniversary, and every year he adds another charm to it.
Who kissed who first: Will.
Who made the first move: Elizabeth, verbally (suggestively) at least.
Who remembers things: Both?
Who started the relationship: Elizabeth, basically forced him into confirmed they were indeed a couple, began sending out couples’ Christmas cards that first year of dating.
Who cusses more: Split between the both of them. Henry developed fairly quickly, and learn ‘bastard’ from his dad, and ‘arse’ from his mum.
What would they do if the other one was hurt: Die inside probably? Break down?
Who is the dirty talker: Will.
A head canon: They move into a recently renovated lighthouse on the English coastline where they bring Henry up, and grow old together until the age of 90, when Will ultimately dies two weeks before Elizabeth.