Murderer Girls

Characters of a future webcomic project... or something. They are a group of killer ladies. 8D
Let's introduce them:

Dolly - Dolly wants to play. To her, humans are toys. She even thinks she's a doll and her doll Patricia is herself. I would say she's a little confused.
Her favorite killing tools are experimental drugs. O_o
Or guns, when she is in a hurry.

Rachel - Rachel wouldn't hurt a fly. She's a very kind and calm person. Until you strip her. Then she become the ultimate killing machine.
Her favourite killing tool is anything.

Sandra - Sandra is a completely normal person. She complains a lot about being fellow with those two crazy weirdos. Because she's not a madwoman. Okay, she kills people sometimes, but that's all.
Her favourite killing tool is her modified hedge trimmer.