Her character description is https://rezero.fandom.com/wiki/Beatrice

((She looks down on others, mean, blunt, doesn't like being disturbed in her library. Tsundere, lonely. Says "I suppose" a lot.))

age 400+, eyes blue with pink butterfly patterns irises, long blonde hair tied into vertical drill-shaped twin tails, 4'7 small, petite body, cute.
Wears pink frilly ornate dress with white trimmings, exposed front that leave her legs visible, pink and purple vertically-striped tights, small crown.