Luna - Warmth
Luna had several ways of staying warm, but her favorite had to be cuddling with her stuffed animals.
She had stuffed dragons, unicorns, thestrals, and other creatures only she and her father had identified. All she had made herself, with a needle and magically transfigured fabrics. She’d also made her friends’ favorite animals and given them as gifts to the ones who technically didn’t have pets of their own.
To Pansy she’d given a full blooded kneazle and to Draco she’d given an occamy. Both lived in places of honor amongst their things. Luna was quite proud of her creations, and she knew that sometimes the occamy ended up in bed with Harry and Draco. The kneazle Pansy would sometimes sleep with when Hermione stayed up late working.
Luna, of course, slept with her own menagerie every night. She shifted them to different places every evening as well, so none would feel left out or stuck where they were put. And of course, she cast warming charms to keep everyone (herself included) warm.