Aoi Kurenai
Mad Skillz
And by that I mean those series that just always seem to be overshadowed or forgotten for whatever reasons. Mine are Ultraman Max and Kamen Rider X, X was stuffed in between two of the more well known series of that franchise and I feel that he's just gone way to underrated over the years. Max, I don't even think Tsuburaya knows what happened there. At first it was set in the original timeline, then along comes Mebius and more or less throws that out of whack. But it's easily one of my favorite series of recent years. And it has something we'll likely never see again, a toku series where the hero doesn't have a power up.