Ultraman Dyna

As I mentioned in my Tiga recommendation, it was also the same as for Ultraman Dyna. Since as with Katsumi, R/B's Minato Isami/Blu also had a lot of similarities shared with Dyna aka Asuka Shin. And alongside reference to plots from Ultraman Tiga, R/B also contained a lot of parallels from Ultraman Dyna as well. So I'm definitely recommending both series because of the huge homage R/B had in connection to the series.