ノヴァーリス(花騎士)
The personification of Novalis rose, a breed of lavender-colored roses named after the pen name of a famed German poet who coined the concept of blue flower (which does not exist in nature) in several of his literature.

In-game, she is the queen of the Winter Rose, though she started off as a low-rarity Flower Knight. She gets the "Snowflake Queen" form on 21st January 2019.
novalis (flower knight girl)