What could be a better addition to your reaper costume than a death of rats sitting on your shoulder? Actually you don't even need a costume to carry him around, can you imagine the look on people faces when you walk with him on your shoulder :) I am sure all the rodents from the neighborhood would be gone in a minute.
You can buy the pattern here:
Crochet reaper is 16 cm (6.3 inches) height.
I've also made the Death of Fleas, I only let it out of sight for a minute and haven't seen it since :)