As of writing this guide, Genshin Impact 2.4 doesn't have any characters or weapons which use Mist Flower Corolla as ascension material. Mist Flower Corolla doesn't have much use besides crafting purposes or being used in the "Darknight Hero's Alibi" quest. I'll still recommend you to farm them a bit extra to be on the safer side in the future if any character will use them. I always prefer to pre-farm materials to avoid running low on them later.