Uh, correct me if I'm wrong, but weren't there IJA holdout that lasted until the 70's IOTL?
They weren't really actively fighting.
Onoda spent most of his time hiding, although he did some small scale attempts like burning rice, and did get into a few shootouts with the police and people looking for him.
Nakamura/Palalin/Lee Guang-Hui was discovered by accident and was basically living out on his own.
Yokoi, as best as I can tell, just trying to stay alive. Although he did try to kill the two fishermen that found him.
There's no proof Nakahara Fumio actually survived until the 1980s.
Shigeyuki Hashimoto and Kiyoaki Tanaka are a weird case.
They're
technically Imperial Japanese soldiers who didn't surrender until 1990, but after 1945 they joined a Malaysian Communist group that was fighting to keep the British out, and didn't surrender until 1989.