[Kiwami]

It depends really.

Black RX was not good at all IMO. Some fun can be had, some episodes are very well done ("Robo Riders Birth" comes to mind) but the majority of it is so run-of-the-mill and boring that it hurts. Especially coming off of Black, which is by no means perfect, but so much better.

It's a prime example of a sequel that tries to cash in on the success of a popular show without keeping anything that made said show so enjoyable in the first place. You could rename the main character, change the name of the Rider and the show would still work, that's how bad of a follow-up it is. The only thing that clashes with that would be the episodes were Shadow Moon returns as he's the only character from Black to come back besides Kotaro himself, but that’s all really.

Ginga S on the other hand? That show is awesome. It follows up a small, experimental entry in the series with a better budget yet keeps all the charm of the original and adds some of its own.

The characters and world they live in are evolved based on the events of Ginga: New characters, heroes and villains are added like missing puzzle pieces into a new, bigger picture.

The new Ultraman, Victory, his origin and motives clash wonderfully with the main hero without being too obnoxious and the new villain is delightfully evil. Plus, most if not all important characters from the predecessor return.

Ginga S really is a sequel done right. Not only because it’s arguably better than the original, but because it also features some of the best single Toku episodes I've ever seen. "The Tears of Gan-Q" is always worth being mentioned, it's so typically weird yet full of charm which is what I love about Toku.

The bottom line is: As with other media, a sequel can vary from perfection to being absolutely awful. Most Toku sequel shows (and movies) I've seen are rather bad, but some like Ginga S prove that it can be done right.