Roadhog
As someone who lives a particularly grimy life (what with being a Junker and a criminal and all), Mako's prepared for just about any situation that requires medical attention
The man's surprisingly resourceful in that aspect
That means he's got cold medicines stocked for days to help you get over your sickness
After a quick assessment of your symptoms via some mild questioning, he'll pick out the one he thinks will suit your situation best; of course, he'll also keep any allergies you have in mind
He's also a pretty damn decent cook, so not only will he pamper you while you're bedridden with the snacks and drinks of your desires, he'll also whip up soup and other cold remedy foods
He tried to make tea once but there is a limit as to what this man can do with his giant hands
Lets you stay in his big bed
Wraps you up with a multitude of cozy blankets and gives you a piggy plushie to cuddle
Overall, he just pampers and dotes on you the entire time
He's not afraid of getting sick either (this man has the immune system of a god) so he's not afraid to snuggle up with you and give you smooches despite the sickness you're currently enduring
He's also learned a few other more unconventional tricks to help you feel better if you're comfortable with trying them
For example, orgasms can help clear your sinuses
Winston
Poor gorilla man is worried for you
Of course, he knows it's just a common cold but that doesn't make his heart hurt for you any less
Especially because he can't really take time off work, so he can't be home to take care of you like he'd like to
Brings you a healthy breakfast packed with cold fighting foods in the morning before work
Probably brought pre-made lunch as well just in case he can't make it to visit later
All you'll have to do is pop it in the microwave to heat it up
Makes sure you're doubled down with blankets, medicine, fluids, and some sort of mild entertainment for the day
Calls or sends messages to check in with you whenever he has free time at work
After work he comes over to check on you again
Practically waits on you the entire evening
Probably ends up falling asleep at your place
Probably on the floor or somewhere nearby where you're resting after making sure you're set for the night
Reinhardt
He is wholeheartedly ready to risk getting sick in his cause to make you feel comfortable during your cold
This includes all the smooches and cuddling and the like that he would normally do, if not more of it
He wants to shower you in love and affection
Cooks all the meals
Makes sure you're cozy with tons of blankets, healthy snacks, fluids, and something to keep your mind off the cold
That thing may be TV or it may be him, who knows
Takes up all your chores (and probably goes a lil overboard with them)
Spends literally the entire length of your cold taking care of you
He probably catches the cold soon after you're back to being healthy
It was worth it to make sure you were cared for during yours