Some 501st headcannons I think I’ll leave here.
The 501st reacting to you having cold hands (I’m projecting bc I have very naturally cold hands but whatever)
Captain Rex
You reach out to grab his hand on your way out of the 79s he yelps a little and jerked his hand away.
“What’s wrong?”
“You’re hands are freezing!”
“Then warm them up for me captain”
As you tuck your arms into his he is a little hesitant only because he is not used to physical touch. But relaxes the more you cuddle tighter to him and secretly wishes never to let you go.
Fives
You are sitting across from the rest of the boys at the 79‘s when you lay your hand on the table the air is a bit crisp and your outfit is not covering much skin. Fives goes to give your hand and affectionate squeeze but is quickly put off by how cold and clammy your hand is.
“KRIFFING HELLS!”
“What??”
“Are you dead or something? Your hands are ice cold!” 
You scoff and put your hands back in your lap in a weak effort to warm them up yourself. Fives tuts and takes your hands in his “gotta fix that” he smirks and claps his warm calloused palms over your smaller clammy hands. Goosebumps erupt on your skin which does not escape his notice. He smirks again and kisses the tops of your knuckles.
Echo 
Echo is one of the naturally cold handed people so once you feel one another’s hands you bond over peoples reaction to it.
“Fives says I must be half droid by the way my hands feel” he tells you rolling his eyes.
“I know! He thought I was a corpse come back to life!” You both laugh at your similar experience in the teasing.
He holds out his hand after a brief moment of silence. Wordlessly asking you to put your hand in his. Of course you do just that. And for the first time no one immediately jerked their hand from your grasp as if they had been burned.
Instead he just feels the shape and weight of it resting in his own. He wasn’t kidding his hands definitely felt like a droids. But you didn’t mind, not one bit.
“Your right you are worse than me” he chuckles. You scoff and smile reaching out with your free hand to lightly smack his chest plate. He chuckles at that.
You reach out again after a moment to feel his face which was the opposite of his hands and instead extremely warm against your touch. Still a bit scratchy from his recent shave.
He winced only for a second then melted helplessly into your touch.
Jesse
“WHOA” he yells dramatically after you invited him to feel your frozen hand. “Are you still thawing out from being trapped in ice?”
“Yes how did you know?” You exaggerate your eye roll. He chuckles “here, give them to me” he says and holds his hands out palms up.
You place your own in his and he slowly takes his time swirling his thumbs over your knuckles. “Kix told me there are tricks for things like this” he begins “they are most common for helping people with hypothermia but this is basically the same thing” you giggle at his dumb joke. Which makes him smile.
“The trick is to have the frozen person get as much body heat from another person as much as possible” he smirks. You raise a brow at him. “And?” You ask “do you plan to save me with your body heat?” You prompt.
He winks at you “oh I can think of several ways of doing that sweetheart but that’s not ideal right now not here at least” you roll your eyes and scoff playfully.
“Hey ! You walked right into that one!” He points out. You nod and laugh “alright I know! But seriously in a life or death situation if I was coming down with hypothermia what would you do?”
He still held your hands in his palms locking them in firmly. “Well there’s putting them in my armpits but I’m not sure you want me to do that” he prompts. You frown “if you put my hands in your pits I’m never speaking to you again” you threaten.
He laughs, throwing his head back as he does so. “No no I won’t do that. Unless you change your mind. But the next best way is like this.”
He guides your hands to his VERY warm cheeks and holds his equally warm palms against the back of your hands. Toasting up both sides.
You note that your whole hand does a poor job at covering his whole cheek. And his hands blanket yours completely.
“So am I cured?” You ask after a moment or two passes. “Just a couple more seconds” jesse responds.
Kix
The campfire was helping only a little to thaw out your icicle fingers. It felt as though at any moment they would snap and fall off your hands. Your teeth clattered mutely in your mouth, clamping your jaw shut, you didn’t want to disturb the boys around you. Or make them think you were affected in any way.They of course looked completely unbothered by the bitter chill of the planet.
“Hey, you okay?” Kix murmured on your right. “Ye-yeah j-just a little cold” you answered as fast as possible so your teeth clattering was not audible to the whole planet.
“Give me your hands” he ordered. You unwrapped them from the thin GAR issued blanket and your only source of minimal warmth to give to the clone medic.
“Oisk. Sweetheart, you should have said something your ice cold” he scolds. “Here I have a heating pad” he says pulling a tiny orange and white package from his pack, he takes it in both hands and rubs both sides as if he was starting a fire in his palms to activate the warm stuff inside.
He hands it to you after a moment and you gently weigh it in your palm. It’s not only warm it’s a perfect warm. Like the perfect temperature to step into bathtub. You groan at the pleasant feeling and stuff it away inside your blanket. Switching it over in both hands to evenly distribute the heat.
He chuckles at your response and scoots in closer to wrap and arm around you. “T-thank you” you say. He kisses your temple. His lips also supplying a bit of warmth. “Don’t mention it” he smiles.
Hardcase
“Holy shit! you weren’t kidding huh?” Says Hardcase holding your hand. “I told you” you say playfully “it’s like holding a dead fish!” He exclaims.
“Hey- wait a minute okay…” you frown. “I’m just kidding honey you don’t feel like a fish” he pauses thinking over his next words. “More like a Geonosian zombie” he smiles proud of that joke. You raise a brow at him.
“So I’m a Geonosian zombie?” You ask crossing your arms over your chest. “You FEEL like one yes” you sigh shaking your head
“You are amazing at complements you know that? I mean most people just say: ‘wow you have cold hands’ or ‘you feel like an ice box’ not ‘wow you feel like the most grotesque creature in the galaxy a Geonosian zombie’ ” you say.
Hardcase sputters his hands flying out in all directions trying to explain himself. “Hey! You know I don’t mean that! I’m was just-“
You laugh at him, and kiss his cheek. “It’s okay I’m just messing with you” you tell him “I know but- not cool” he huffs. You giggle. “Come on lets go” you say grabbing his hand.
