Since I'm trying to "recreate", "redesign, or better yet "reinterpret" fanfiction characters in this... uhm... 3D style... I guess I'll have to tell who the characters are supposed to represent.
The girl with the knife is Alice from the video game "American McGee's Alice" (or "Madness Returns" if you prefer)
The girl with the volleyball is Sibella from "Scooby-Doo and the ghoul school"
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