I'm not super knowledgable when it comes to tokusatsu but I do love what I've seen of Ultraman Nexus. It's a very J-drama take on Ultraman that plays with conventions that the series takes for granted: the overarching security force is untrustworthy, the monsters reappear across episodes and the role of "superhero" is passed from person to person as the story continues. Broadcasters had no idea what to make of the series, it was left to die in a timeslot for kids and was cancelled before it could finish airing, but it's one of the bravest shows in a franchise already known for big swings. It reveres the Ultraman character even as it places them in a context where it's even tougher to do good.
(Also, the theme song is a banger)
