a monster that was created by victor Frankenstein and went in rampage 

a monster that was created to be eve but failed

Bilac (ビィラック, Byirakku) is the Emul's older sister and Vysache's eldest daughter. She inherited her blacksmithing skills from her father. She speaks Hiroshima dialect which is a subtle mixture of her official 
language. She is a highly skilled blacksmith and can also create quite powerful weapons, that suit the enemy on the spot. Most of the weapons Sunrako uses are created by her

Vysache's legacy weighs heavily on Bilac, a serious-minded rabbit who takes her father's role seriously. Idolizing 

Black bunny, black smith, from Slf

In her Rabbit form she appears as a white rabbit with floppy ears in a stage magician's outfit(complete with a top hat) that's kinda a cross between that and the white rabbit from Alice and Wonderland. Like the Disney version of the white rabbit she has a pocket watch that she seems to check every so often. Later in the story she showcases that she can temporarily become human where she looks like a young girl wearing a similar outfit and has pink hair.