There are admittedly loads of 'underrated artist' threads, but - probably because of the language barrier - there seem to be a whole host of really fantastic Japanese chipmusic composers (many using MML...!) who don't get much press in the Western chipmusic community. I'm 95% sure there isn't already a thread on this topic, so it's about time the spotlight went to them.
Lazerbeat is almost certainly the authority on this but to get the ball rolling here are the artists that I was forwarded that inspired me to start this thread:
Tappy - amazing guy who makes tracks for a variety of platforms. I love the one called 'opm_303_not_owned' especially.
Dong - he contributed a track to the wonderful Soundshock FM Funk compilation on Ubiktune; here are some other tracks of his.