This is the comprehensive list (as far as I know) of all IJAAF night fighter squadrons and how to get them. Many thanks to Obvert, Koniu, Fcharton, Pax Mondo, Spidery, Mr. Kane, Lokasenna, and Alfred who found the answer to very mysterious 28th Sentai.[&o]
4th Sentai Tokyo restricted 36 planes (starts in fragments with recon planes look on Formosa)
5th Sentai 42 planes (starts as Nates)
(they both go to 49 in March 44)
81st IF Chutai 12 planes III KAI Dinah (starts as a Babs unit, fragmented)
82nd IF Chutai 9 planes III KAI Dinah converts to 28th Sentai at some point (may 1944 upgrades to 27 planes)
14th Sentai (starts as a Sally): Upgrade to Peggy; 27 planes (once upgraded to Peggy, can then go any Army NF model)
53rd Sentai reinforcement 49 planes; 4/44 (upgrade to Nick D from another Nick model)
107th Sentai reinforcement 27 planes; 10/44 (upgrade from a Peggy squadron)
106th Sentai reinforcement 49 planes; 10/44 III KAI Dinah
16th IF Chutai reinforcement 9 planes; 11/44 III KAI Dinah (comes in two parts 5 days apart)
Army NF Models:
Nick D: Your first NF, with a little research you can get it prior to B29s. Slow, armored. You need this plane to upgrade the 4th and 5th Sentai to open up the NF choices.
III KAI Dinah: Twin engined, no armor, fast. Not very good to be honest. SR2
Peggy 109I: Faster than Nick, one big honking gun; SR 3 is a handicap
Randy 102C: On paper the best Army NF in the game. FD2 Radar doesn't activate until 10/45 but head and shoulders better than the rest even without radar which none of the other planes have anyhow.
