Elemental-themed characters are always interesting to play, as are themed characters who are built around certain doctrines or abilities. If you look at cantrips that deal with the ice and the cold, you could build a Cyro-caster if you want. There are various spells from all levels that are focused on the cold, and some of these include Absorb Elements, Ice Knife, Cone Of Cold, Ice Storm, and also potions of cold resistance, and other magical items that reduce the cold. It's a lot of fun to build a themed character, and you can easily create a backstory that focuses on cold, the mountains, snow, and the howling wind. Cryo-focused spells focus on damage and also slowing targets down. Of course, you might need to speak to your DM to flavor some existing spells to help them focus on ice and water magic. Make sure to talk things out and see what can be done, but most DM’s will gladly help their players make a reasonably powered themed character. Then they can weave the story together with your theme, and that adds more to the entire game.