To provide some inspiration for your drones, have a look down here.

Links

http://spectrum.ieee.org/automaton/robotics/drones/epfl-bioinspired-hard-to-destroy-drone
http://www.wetalkuav.com/drone-battle-bots
https://techcrunch.com/2016/08/17/the-rise-of-drone-battling-for-the-battlebots-generation