Kuriru Wakasagi from the Kirei ni Shitemoraemasuka Manga series. Wakasagi is a type of freshwater smelt popular for ice fishing.
Trigger: Wakasagi Kuriru
Description: brown hair, short hair, purple eyes,
Wears kinda slovenly outfits like "school uniform, shirt, plaid skirt, plaid bow, shirt" or "tied t-shirt, shorts", or "hoodie, bare legs" or something like that.