I'll be honest, I'd love to see the P-61B added eventually and I think it would see a lot of use in AH, maybe even to the point of being perked, but that use would mostly be based on its good maneuverability, quad of Hispanos in the belly and the 6,400lbs of bombs it could carry.
If you want the best night fighter that served in WWII you'd ask for the Mosquito NF.Mk 30. It also has a quad of Hispanos in the belly, but it could do 425mph or so but could only carry a single 500lb bomb under each wing.
Both the P-61 and Mosquito NF.Mk 30 saw service during daylight as well as at night owing to the increasingly absent Luftwaffe and Imperial Japanese air forces.