I did a search of the forums and saw this Japanese plane mentioned a few times (a year or two ago), but figured I'd throw this out.
Mitsubishi Ki-46-III Kai "Dinah"
Type: Two-seat high altitude interceptor
Max Speed: 390mph
Service Ceiling: 35,000ft
Armament: 2x 20mm fixed forward-firing cannons in the nose, 1x 37mm Ho-203 obliquely forward/upward firing cannon in the upper central fuselage.
I'm thinking it would be fun to plink at the B-17's and Lanc's from underneath with the 37mm.

