First of all I made this post because people keep suggesting the wrong things to add to Japan when there are only so many prototypes you can add. IMO they have so many historically accurate content to add, which are their planes. For a very plane-heavy faction historically, Japan in Enlisted lack quite a lot of their iconic planes. Here are just some of my suggestions, BR rankings are purely opinion.
BR 2
Ki-43-II
- Offensive armament
2 × 12.7 mm Ho-103 machine gun
Ammunition
500 rounds
Fire rate
900 shots/min
- Suspended armament
Setup 1
2 × 50 kg Army Type 94 GPHE bomb
Setup 2
2 × 100 kg Army Type 94 GPHE bomb
Setup 3
2 × 250 kg Army Type 92 GPHE bomb
Ki-44-II Hei
- Offensive armament
2 × 12.7 mm Ho-103 machine gun
Ammunition
500 rounds
Fire rate
900 shots/min
2 × 12.7 mm Ho-103 machine gun
Ammunition
500 rounds
Fire rate
900 shots/min
- Suspended armament
Setup 1
2 × 50 kg Army Type 94 GPHE bomb
Setup 2
2 × 100 kg Army Type 94 GPHE bomb
BR 3/4
Ki-61 Otsu
- Offensive armament
4 × 12.7 mm Ho-103 machine gun
Ammunition
1,000 rounds
Fire rate
900 shots/min
- Suspended armament
Setup 1
2 × 50 kg Army Type 94 GPHE bomb
Setup 2
2 × 100 kg Army Type 94 GPHE bomb
Setup 3
2 × 250 kg Army Type 92 GPHE bomb
B7A2 (Homare 23)
- Offensive armament
2 × 20 mm Type 99 Model 2 cannon
Ammunition
400 rounds
Fire rate
490 shots/min
- Defensive armament
Turret — 13 mm Type 2 machine gun
Ammunition
1,000 rounds
Fire rate
936 shots/min
- Suspended armament
Setup 1
10 × 60 kg Navy Type 97 Number 6 ground bomb
Setup 2
4 × 60 kg Navy Type 97 Number 6 ground bomb
2 × 250 kg Navy Type 98 Number 25 bomb
Setup 3
800 kg Number 80 Mod. 1 bomb
Ki-43-III Otsu
- Offensive armament
2 × 20 mm Ho-5 cannon
Ammunition
300 rounds
Fire rate
948 shots/min
- Suspended armament
Setup 1
2 × 50 kg Army Type 94 GPHE bomb
Setup 2
2 × 100 kg Army Type 94 GPHE bomb
Setup 3
2 × 250 kg Army Type 92 GPHE bomb