Beatrice Flowerchild (ベアトリス・フラワーチャイルド, Beatorisu Furawāchairudo?) is a Doll in service to the Ainsworth family. She was the Card User of Berserker in the Fifth Ainsworth Holy Grail War. She is also the Card User of another Berserker Class Card.
After dying a first time, like Angelica, Beatrice's personality was placed into a doll body by the Ainsworth family to serve as their servant. She was an acquaintance of Julian during her lifetime and seemed to have died for his sake at a certain point. After being brought back to life alongside a few deceased mages, she is given the Berserker Class Card of the Fifth Ainsworth Holy Grail War in order to participate in the War and defeat Shirou Emiya.
Beatrice is shown to be highly volatile to the point of potentially bipolar. Appearing to take great joy in violence, she tends to get irritated easily if people survive her onslaughts. She has a love of stuffed toys and Julian Ainsworth, but her girlish affection for Julian can quickly turn into a violent depression in which she rips the heads off of stuffed toys she steals from Erika.
She is in conflict with her very own self. Instead of revealing her true thoughts on her actual situation and on Julian, she uses remarks that she doesn't wan't to say like commenting on the fact that she is obligated to help him because he already helped her when she was supposed to be dead. She thinks that both he and herself changed and she claims that she wants to go back to the time where things weren't like they are now.
Fate/kaleid liner PRISMA☆ILLYA 2wei!
She appears for the first time at the end of the series alongside Angelica, following the fight with Gilgamesh. When a rip in the world was created by Ea, she uses Mjölnir's lightning strikes to paralyze their opponent and allow Angelica to install the Archer Class Card. They then proceed to recover Miyu before they are again teleported to their own world.
In Fate/kaleid liner PRISMA☆ILLYA 2wei Herz!, they don't involve themselves after the fight and only appear in the very end of the series. They will only kidnap Miyu at the start of the anime adaptation of Fate/kaleid liner PRISMA☆ILLYA 3rei!!.
Fate/kaleid liner PRISMA☆ILLYA 3rei!!
Her primary weapon is the Berserker Class Card holding the spirit of Magni, son of Thor. The card's Include mode is initiated by merging with her right arm morphing it into the massive arm of Thor, easily twice her size, and grants her his great strength.
Install mode grants Beatrice Magni's attire along with his arm and Mjölnir. Install mode allows her to fully realize Mjölnir's power as lightning strikes capable of breaking even atoms, however the hammer's power is limited if she channels it indoors.