P-38 Lightning. In my opinion, it's one of the most unique aircraft and the most successful to come out of the heavy fighter idea(Beaufighters weren't bad either but were less capable against fighter aircraft). These machines flew on all fronts of the battlefield from the very beginning of US involvement in the war to the very end. It was the most successful multirole aircraft of its time, having no real liabilities with the exception of maybe locking up in a dive and killing you.
http://vignette3.wikia.nocookie.net/world-war-2/images/d/d2/P-38J_Air_Show.jpg/revision/latest?cb=20140222045954
Fictional? The Xcom Raven. How badass of a plane do you need to be to shoot down a space ship with little to no modification? Pretty fucking badass.
http://vignette4.wikia.nocookie.net/xcom/images/c/c9/XEU_Interceptor_Raven_take_off.jpg/revision/latest?cb=20121109013442
http://vignette3.wikia.nocookie.net/world-war-2/images/d/d2/P-38J_Air_Show.jpg/revision/latest?cb=20140222045954
Fictional? The Xcom Raven. How badass of a plane do you need to be to shoot down a space ship with little to no modification? Pretty fucking badass.
http://vignette4.wikia.nocookie.net/xcom/images/c/c9/XEU_Interceptor_Raven_take_off.jpg/revision/latest?cb=20121109013442