You want a static climbing rope like this
one.
You do NOT want drop hanging where your neck breaks. You want to kick the stool over with just a little slack in the rope... you should lose consciousness in under fifteen seconds with full suspension. Remember to keep rope high on neck, under jaw.
Single most important thing: please make sure you have a reliable rope and anchor point. I've read a lot of threads where people survived because they used a shitty electrical cable or tied the rope to a random pipe overhead which broke. Those are not things to take chances with given the possible repercussions of failure.
Btw, love attack on titan.