The first character design was based on the character whose name is at it's origin (I dunno what I am saying, UWU!), Lillian of Defense Witches 2.
Not much character build other than being a girl version of Julius Novachrono of Black Clover, but then-- Siah (lol, a friend) had taken the interest of Lillian's class and started to claim Lillian as synonymous to her avatar (who has gray hair!), so her personality was slightly molded similar to her.