race features:
Apperance. As a child born of a Yuki-Onna you resemble a half elf with features of Winter elves, with pale complexion and cold tones
Darkvision. Thanks to your Youkai blood, you have superior vision in dark and dim conditions. You can see in dim light within 30 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray. You also can see trough blizzard conditions as normal
Fey Ancestry. You have advantage on saving throws against being charmed, and magic can't put you to sleep.
Born of Winter. You have resistance to cold damage and the are immune to the effects of extreme cold, you ignore the effects of Difficult terrain caused by snow and ice. You also are quite cold to the touch and can Freeze 1ft cube of liquid with a touch as an action.
Youkai Magic You know the Frostbite cantrip. Starting at 3rd level, you can cast the Frost fingers Spell and the Disguise self spell with this trait. Starting at 5th level, you can also cast the Sleet Storm spell with this trait, without requiring a material component. Starting at 5th level, you can also can cast the Ice Storm spell with this trait, without requiring a material component. Once you cast a leveled spell with this trait, you can't cast that spell with it again until you finish a long rest. You can also cast either of those spells using any spell slots you have of the appropriate level.
Intelligence, Wisdom, or Charisma is your spellcasting ability for these spells when you cast them with this trait (choose when you select this race).