Suggest you take up ornithology. Dragonflys can fly backwards at the same speed as they can fly forwards.
Sorry to be pedantic ...
Ornithology is the study of birds. Dragonflies, being insects, are of interest to entomologists.
In the matter of aircraft that fly equally well in all directions, isn't there a small unmanned military observation platform that is/was under development that is shaped something like a space capsule with a double rotor at the top. That would be capable of flying in any direction.
I can't see a fixed wing aircraft being capable of backward/forward flight. Threre would be the problem of transiting from one direction to another. Much easier to just turn!