"Honkai Star Rail" names her as "Seele" and she looks a lot like "Seele Vollerei" from a different game "Honkai Impact" "Seele Vollerei" is reserved, but has an energetic alter ego named "Veliona" in Honkai Impact.
Honkai Star Rail fused the appearance of "Seele Vollerei" from Honkai Impact with "the personality of "Veliona" from Honkai Impact and called her "Seele". Confusing? Yes. Saves artist budget money? Probably.