Tanya

A soldier that fought on the icy eastern front, she became used to all the ice and her magic changed, which did help a lot with it. They mainly used hit and run tactics to be able to do the most damage with their rather small amount of resources to make sure the other side had it even harder. She also adapted the weopns she used, because the supply lines made it hard to replace normal weapons when they broke, even more likely by the climate, so she ended up using weapons made from her own magic, ice formed into chains she could swing to attack from a decent distance or reinforced claws if she was forced into close combat. And for some reason some birds decided she was a good resting ground and she did tolareta them outside of battle. Made the days a bit happier. Most famous attack on that front was lead by her, a direct, successful attack into the main part of that clan where they burned the buildings and only attacked the ones that attacked them. It was just a destraction so they focus their forces there but it was a very effective one. She met a rather... unpleasant fellow named Loria, high position in that clan and essentially untouchable by the laws because of fear of punishment so noone said anything to his questionably moral doings. He developed an... interest in her which did lead to his demise because her trusted subordinate she shared her pain with that time they had to Film propaganda cut his life off the first chance she got. They did spend a decent amount of time there, in the cold. They thankfully managed to keep each other warm even when supplies where sparse.
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Tanya von Degurechaff from Youjo Senki/Saga of Tanya the Evil