On another forum, though I admit that I'm not sure where they got it from. I shared this because I thought it sounded interesting and we didn't have much else so...

Well, who knows - I hope it's true because it's totally weird.

I think if this rumor become true, Kamen Rider Build Series will be like Kamen Rider Double Series because has earth concept and has various motifs and themes in one series.

I hope Kamen Rider Roots is female Rider. :D

Painter Rider as secondary Rider should be interesting and I really want secondary Rider as true hero not as antihero because most of secondary Rider are antihero (usually at beginning).

Build, paint, plant/garden. All acts of creation. If this is true I assume we will have a high rank villain with a god complex somewhere along the way. Heck would not be surprised if there is a chef rider as well.

You know what would be really cool? An anti-hero Primary Rider. I doubt that would happen since kids like bright, cheerful main characters and Anti-hero tend to be quite unlikable, at least at first, but damn has it been a long time since we've had a jerk main rider. Decade/Kabuto 3.0 anyone?

Yeah..I also really want Anti Hero protagonist Rider. I felt I miss badass Kabuto and Decade's fighting style. Hmm..I must re-watch Kabuto and Decade again.......

So KR Build is an artist theme?

Maybe. We don't know - they could just be rumours. Remember the rumours about Ex-Aid being ambulance themed, with a fireman second rider?

Well, Build has definitely started filming as this week's Ex-Aid looked pretty sparse compared to the psychedelic overload of a typical episode.

Kamen Rider Bulid
 

When I translated what it said on trademark bot's account it said "It has been clarified from the publicly trademark bulletin that Toei Corporation has applied for trademark registration "Kamen Rider BUILD". Application number is 2017-67871 to 2017-67892."