On the topic of Japanese emcees, I can't believe I only discovered who Lyrics Born was a few months ago.
He performs in English so not exactly like MC Boo but I would still recommend checking him out.
I have heard his voice for years guesting on some Jurassic 5 tracks, but never realized he was his own entity.
This was the album that got me hooked:
https://open.spotify.com/album/2Aran...R3GAGrVyQgyXYQ