dead tie for me between the ki-100 and the george. george has 4 x 20mm cannon standard, and can duel easily with the hellcat, the main us navy fighter. ki-100 was an easy solution for tons of radial engines and tons of ki-61s with no inlines to put in them, but it was pretty capable in good hands
on a sidenote, dont doubt the J2M. might have been troublesome with its complex engine in the jungles, but then again, which aircraft didnt have jungle problems?