As of now,the japanese planes in game are quite underpowered compared to what the allies have in all BRs but 5,and even then it isn’t 100% equal.I will propose some Japanese planes to be added and some existing plane’s BR be changed.
BR reductions
D3A1 → BR1
this plane has just about the armament of a stuka but with zero armour,terrible MGs,a very weak engine that makes you feel like you wont make it off the carrier into the sky most times,and you are very very slow.
D4Y1 → BR2
Japan’s only bomber with a 500kg is fighting the highest tier planes with measly 7.7mm machine guns while the US has their bomber with an equivalently large bomb (dauntless),2 extra bombs,and 50 cals,which tear apart any japanese aircraft.Moving this to BR2 will provide more use of this plane due to it reaching obsolescence in high BR and give more diversity in plane play.
B5N2 → BR2
Japan’s BR3 bomber is not good.slow speed,weak engine,no MGs,and has about the same bombload as the P51D.the only “good” part of this plane is the bombs being center mounted so you can be more accurate with them,but that doesn’t account for if you make it far enough to bomb,as the western allies often have at least 1 person in a plane at all times and AA guns are always a probability.there is also the chance you get uptiered into BR5 for simply using this vehicle,which goes without saying is not a good time.doing this will,again,give more diversity in japan’s plane line.
Suggestions
D4Y2,BR2
very similar to the D4Y1,this version of it would be the same except for 4x Type 3 No.1 Mod.28 Mk.1 rockets to help give Japan something kind of close to a P38 (but only in the bomber role),but maybe have slightly worse handling or turn speed to balance it.it would be foldered with the D4Y1.
Ki-43-III otsu,BR3
it would preform similarly to the zero,but trades the 7.7mms with their massive ammo pool for more ammo for the 20mms and slightly better bombs (100KG on this,60KG for Zero)
D4Y3 Ko,BR3
3x 250kg bombs and a 13mm gunner,otherwise the same from the D4Y1
Ki-44-II otsu,BR3
a big twin engine bomber with a slow turn speed with no primary guns and only 7.92 turrets to defend you,it makes up for this lack of guns by letting you use an early guided missile,which will be helpful against greyzone camping shermans.the lack of guns makes you vulnerable to enemy planes,so you would likely want to use it when a friendly fighter is in the air.
A6M5 Hei,BR4
A plane with 2x 20mms,3x 13mms,and 10 Type 3 No.1 Mod.28 Mk.1 rockets,somewhat of a counter to the AP4
B7A2,BR4
Scale up the D4Y1’s armament and this is what you have,an 800kg bomb and 2 20mm cannons,but that huge bomb makes you a lot slower and less maneuverable