Go check out JayaTeamUltra , they had this on their book called, 'The Jaya Book' and I thought it would be cool to do so on my headcannons book. I scratched out some of the more mature ones so just skip anything in black and you should be on the right track XD. 

-Jay, he likes to cuddle=)

-Love advice for Lloyd...

-Jay, but to be fair he apologizes for stepping on an ant by accident.

-Building/inventing.

-Jay drives and Nya calls shotgun, every time Nya drives they get pulled over because she went to fast. And Jay would distract her too much and they would crash into trees.. they were only talking about puppies!

-Mostly Jay, he feels like a superhero!

- Jay, sparky, freckles, love, bluejay, walkie talkie, etc...

Nya, cherry blossom, darling, love, waterlily, honey, etc...

-Jay.

-Nya, Jay might talk a lot, but whenever it comes to songs she will sing louder than the radio itself on full blast.

-Both, depends on the situation.

-Nya, she likes to make picture albums =)

-Jay, he just can't keep quiet. Gets himself in trouble if Kai hears him...

-Nya, she has the same taste in music as Cole. Rock, soft rock, R&B, hip hop, rap, and country... Jay doesn't like the last one.

-Nya, she remembers everything whenever it comes to Jay. His coffee order is a caramel macchiato with two pumps of creamer and whip cream.

-Both.

-Nya, it soothes Jay whenever he panics.

-Nya, she's ticklish everywhere.

-Jay, and they always keep them. =)

-None, because they dance in the rain whether people are watching them or not.

-Jay, he's a pranker, what did you expect?

-Nya, Jay still has the bug phobia after the whole erased timeline incident.

-Jay, half of the time he's just talking to himself unless the word 'puppy' comes up.

-Nya, she's always cold.

-Jay.

-Nya.

-Jay, he knows they both get cranky if they don't have at least one cup of coffee in the morning.

-Both, especially Old Yeller...

-Jay, he pees himself every time during a jump scare.

-Nya, she's the reason Jay has his curls;)

-Jay, he said it on their two year anniversary and doesn't stop saying it. He could literally burn his tounge and blurt it out at the doctors office when having in inspected.

-Everyone literally knew before they could tell anyone.

-Everyone approves, expect Kai and Ray, they're still threatening Jay even after so many years of dating Nya.

-Nya, she LOVES dancing and so does Jay, but she's just more forward with it.

-Both, their cooking skills are at different levels.

-Nya, Jay's five or six inches taller than her and she loves to wear oversized clothes. Besides she's always COLD!

-Jay, we all know this. XD

-Jay.

-Nya, she overthinks everything.

-Nya, but they would get ice cream later and then she would scold him on getting himself in jail.

-Idk, 'I Love you' by Barney and Friends?

-Nya, Jay couldn't sing to even make the kid bored.

-Texts each other none stop to cope with not being around each other, and making presents for each other as a welcome home present.

-That they will always remember everything that had happened with Nadakhan.

-They know they have each other to deal with it.