Serving as King Virey's personal guard, Bloodberry is the most skilled and level headed of the three royal marionettes, being the group's voice of reason and role model.
When the young prince's older brother, Starface, escapes his exile to seize the throne in a coup d'etat, Bloodberry finds herself as the last line of defense standing between the fair King and his rebellious son as the army of Romaana effortlessly falls under Face's control.
Although she could certainly match Starface's so-called Sexadolls in combat under fair conditions, she doesn't stand much of a chance against them in all out combat, severely underequipped to counter their built-in weapons. Forced to flee, Bloodberry vows to protect the young prince, Virey Junior, and to one day return to save his father.
Taking notice of Lime's potential and sheer, raw mettle, Bloodberry takes it upon herself to train the youngest yet strongest Saber of the group to do battle against Face's forces, confident that together the three of them would be able to deal with the usurper of the Romaanian throne and his Sexadolls.
As far as her abilities go, she's a skilled martial artist plenty capable of holding herself off against multiple assailants without much trouble. She can also detach her hands to use as grappling tools of sorts, being equipped with an extension cable that reaches up to 10.000ft (roughly 3km).
She eventually goes on to form a rivalry with the cockiest of Face's dolls, Brid, who regards her as little more than a toy.

As with all three of the royal Sabers, Bloodberry was built by Starface in better times.

(Sources: Saber Marionette R OVA)