So, what did you think what Verde, Femme, and Ryuga would've like had they made their appearances in the main Ryuki series proper and what roles, whether it be major or minor, could have played into it?

This has been bugging me since going through Ryuki since the show only featured 10 Riders rather than supposedly 13 of them. The creators probably think the term, 13 Riders, either sounds cooler or it just roll of the tongue better than the actual 10 Riders for all I know. Guess the world may never know. *shrugs*

The roles of Ryuga and Femme probably wouldn't have been much different, but my personal headcanon is that Verde is Imperor's' father.

The thing is, the show only says 13 Riders. Not 13 different Riders.

So, I'm pretty sure my next series is going to be Den-O. However, I have a few other seasons that I have full fansubs downloaded for. How would you rank these in terms of which you would recommend?

1971, Amazon, Black, Kuuga, Kabuto, Den-O, Build

From top to bottom:

Build
Kuuga
Black
Amazon
Kabuto
Den-O

I exclude 1971 since I never fully watched it, and want to note that I like all of these shows so it's not like I hate Den-O or anything.

Of that list, just watch Kabuto.

Personally, I'd go with:

Black
Kuuga
Den-O
'71
Build
Amazon
Kabuto

All good shows, though. '71 is a pretty massive undertaking considering the length and age. Amazon, on the other hand, is short but deeply weird.

In my opinion:
Build
Kabuto
Kuuga
Amazon
Black
Den-O
1971

I only consider Den-O and 1971 to be particularly questionable quality. Den-O's tone and characters just didn't appeal to me at all and 1971 is a massive undertaking with some really inconsistent quality. All the others are good fun in their own ways!

Build
Black
Kuuga
Den-O
Amazon
1971
Kabuto

Really, just go with whatever one seems the most appealing to you. If length is the primary concern though, Amazon is the shortest while '71 is the longest.

That list reads like a list of my favorite series! You can't go wrong with any of those