User blog comment:DominatetheFreedom/Infos about the possibility for the new Ultraman/@comment-26939588-20180414214456/@comment-24977527-20180415011721

I'm just thinking "R/B"/ Rūbu is just an acronym for Rosso and Blu.

And by a crazy guess, probably name if they fuse together as their ultimate form (Exceed, Origin, RMM)