Okay, have an idea for your mass character collection thing that you could try out
Hanging meat.

A display of dead characters hanging by meat hooks/rope after they been slaughtered.

The person can choose a character, position and anything that happened to the body, from cuts to missing limbs

For example:

Character: Mina Ashido
Position: hanged upside down, legs tied with rope, hands not tied
Condition: slit throat

Just an idea you could try out, and if not, then maybe you could use my example as a request.