A short list of Japanese aircraft that would be viable in the LWA:
B7A2 'Grace' - A high performance torpedo bomber with two 20mm cannons in the wing roots. 114 built.
D4Y 'Judy' - Fastest diver bomber of WWII. 2000+ built.
H8K 'Emily' - Powerful four engined flying boat defended by five 20mm cannon. 167 built.
J2M 'Jack' - Mid to Late-war Japanese interceptor armed with two to four cannon. 600+ built.
Ki-44 'Tojo' - Mid-war Japanese interceptor generally armed with four 12.7mm machine guns. 1200+ built
Ki-102 'Randy - Late war Japanese twin engined strike aircraft armed with 20mm, 37mm or 50mm cannon. 200+ built.
P1Y1 'Frances' - High performance twin engined bomber armed with one 20mm cannon and one 13mm machine gun capable of carrying two 500kg bombs. 1000+ built.
Ki-43-III - 1230hp engine with 2040kg airframe. 555km/h@6000m, 5000m/5min 19sec.
Ki-43-II - 1120hp engine with more light airframe. 536km~548km/h@6000m, 5000m/4min 48sec.
Ki-61-II-KAI - 1500hp engine, 225kg heavier than Ki-61-I-Tei. 20mm ammo is increased to 200rds from 120rds. 610km/h@6000m, 5000m/6min.
Ki-100-I - 1500hp air-cooled engine. lighter than Ki-61-I-Tei. good ammo and good maneuverability. 580km/h@6000m, 5000m/6min (6000m/6min from another IJAAF public reference).
Ki-61-I-Otsu - Early version of tony. 12.7mm x4 ammo and lighter than Ki-61-I-Tei. 580km/h@5000m, 5000m/5min31sec
Ki-84-I-Otsu - 20mm x4, higher top speed in record. 660km/h@6000m. it's mine.