I strongly believe that, when Emmet is being tickled, he'll compliment his tickler.

"Thahat spot reheally ticklehes!!" He will point out the obvious, he can't help it!

He's not a very hysterical laugher, he gets very loud but he's still coherent through it all. Even if he's got little mirth tears and a dazed look, he's as happy as can be.

"That was so much fun!" He will ask to be tickled again if it stops too soon.

Though, he's all about giving too! He enjoys tickles and wants his friends to be happy too.

As a ler, he's so sweet. He will use compliments more often than not, and he's known for gentle tickles - which can be equally as ticklish as fast ones, and very flustering for whoever his victim is.

He will point out everything, even if he doesn't mean to be teasy.

"Hey, don't cover your face!"

"Awww, I think I see a smile!!"

He's also ticklish just about anywhere, but I'd vote anywhere on his torso is especially sensitive. Specifically his sides!

Now... while Emmet is carefree, Rex is more on the defensive side.

(Also, in a universe where Rex gets redeemed and is very much alive as well as staying in Emmet's timeline.)

Rex will deny being ticklish. He claims its childish and he gave that up a long time ago.

Emmet doesn't believe him, and gives him pokes more often than not.

The sibling energy between Rex and Emmet is off the charts with tickles.

Emmet unlocks a more teasy, sneaky side of himself whenever he tickles Rex.

Rex is a fighter, he will not feel bad if he kicks somebody while trying to escape.

Ironically, Rex is more ticklish on his lower half rather than his torso. But I believe his neck, and ears if we go a more human route, is very susceptible to tickles.

Rex is touch-starved. He was touch-starved already when he was known as Emmet, but being isolated for who knows how long really messed with him.

Emmet, knowing a little too well what it's like to be alienated, helps whenever he can. Such as leaning against Rex, poking him, side hugs - and sometimes gently socking him in the shoulder.

Rex has no problem pulling people into a headlock, ruffling their hair. He'll lean against people but more in a, you-are-my-new-personal-head-rest way. He started punching Emmet in the shoulder first, and like the bad influence he is, Emmet started doing it back probably even more affectionately.

Rex gets very strong tendencies to destroy things. It's as easy as breathing, far more natural than building. That's where stimming comes in, he already stimmed before the whole time-traveling thing. It turns out, tickling someone is a great way to stim...

Emmet is the easiest target, a willing target if anything. Which Rex once upon a time did understand, but refuses to acknowledge.

Rex appreciates doing the tickling rather than being on the receiving end. It's hard to get him laughing anyways.

But when he laughs, boy, does he laugh.

It's loud and chaotic and hearty. He actually has a ha-ha-ha laugh. It's as deep as his voice.

He does have a giggle spot but he will guard it will his life. It makes him sound like Emmet too which is even more bewildering.

When he's being tickled, he can block it out. Sorta. But keep it up, keep him guessing, he'll break in no time. He tries to hold it in, and it's wonderful to watch red blush bloom across his face and his whole cheeks puff up. And then woosh, the laughter pops out and he can't stop.

He cannot admit to enjoying it. He cannot and will not.

Emmet apparently has made it a mission to get Rex to admit it. Because Emmet knows Rex used to love it just as he does, so he knows what buttons to push. He can guess what compliments get him more than others.

Rex's revenge is a million times worse. He will seriously wreck anyone who dares to even try to tickle him.

He won't stop until the victim begs for mercy, and even then he only stops when he truly believes they're sorry.

"Oh? What's that? I can't hear you over all that laughter!"

"You really do snort a lot."

"Oh, this spot must really tickle."

He's got these grins that make you wanna giggle on the spot.

Speaking of killer, Wyldstyle - or who I'll refer to as Lucy - will utterly annihilate you.

Rex will not go anywhere near her. For this reason, and because he's awkward around her. It's Lucy, after all.

Lucy usually treats Emmet nicely, because how could she not melt under his smile?

With Rex, she wants the guy to loosen up. She doesn't like to compare the two, but if Emmet loves this as much as he does and Rex used to be him then... she puts the two together.

But she doesn't push it, she's aware of how her presence makes him feel and she doesn't quite know where to start.

Emmet is a great catalyst and luckily pulls the two closer together.

When the first poke lands, a battle has begun. A very playful one.

Rex and Lucy spend more time poking each other than full on wrecking, but they've had their moments.

Such as when Lucy positively fell flat on her ass trying to build something. Rex laughed, because it was hilarious. Lucy was very quick to keep him laughing if he thought it was so hilarious.

Or when Rex leaned against a bike Emmet made, and it collapsed as soon as he touched it. He hadn't meant to destroy it but there he was in a heap of parts. Lucy was not sympathetic, proven by her snickers. Rex glared, and pounced. That'll teach her from laughing at Rex!

Lucy still struggles to be herself. She's had to be rough and tough for so long. She's seen growing up as mostly a negative thing, and she admires Emmet so much for his constant openness...

...And Emmet pokes, because yes he does poke Lucy too.

Lucy is ticklish and is embarrassed by it. She used to be all about bonding but it's very hard to trust people.

Emmet hates to see her frowning, and always tries to lighten the mood.

Even if that means sneaking in a few scribbles when it's least expected.

Emmet always pretends to be innocent, and accidentally has started a few tickle fights between Lucy and Rex because they think one of them did it.

When they find out it's Emmet, they absolutely double-team him in a temporary truce.

Emmet is proud of both of them and losing it a wee bit from their conjoined efforts.

Lucy begins to enjoy tickling, but she doesn't openly broadcast that either.

She pretends to know what she's doing, but she is rusty.

Laughing out loud without control is very flustering, and she certainty has a sweet laugh.