Akina Nakamori is probably my favourite Japanese artist from the 80s. She was an idol singer whose career became increasingly more experimental, culminating in an album where she was barely visible on the cover and all the vocals were mixed to the back.
On the whole, City Pop is really cool. I do think we end up hearing about many of the same songs due to internet algorithm shenanigans, but there are a lot of hidden gems to discover. Especially the funkier stuff.