Thread:RokuEiyū/@comment-24977527-20190208053312/@comment-11479355-20190208080211

The basic definition of a Final Form as gathered from show trends, official specifications in various material seems to be the strongest form a Rider attains in the TV series. Any stronger forms attained in extra material (movies, V-Cinema etc) are considered to be Extra Final Forms.

For our primary Rider protagonists, this is very clear cut as they are the main stars of their respective shows and their strongest forms are a show highlight. Most of the secondary Riders also have more or less clearly defined final forms in the TV series too.

For tertiary and most other side Riders, this is much less straightforward because side Riders don't really receive as many forms as the main and secondary Riders, and thus they don't really follow the same form progression as them.

I would suggest limiting Final Forms to the primary, secondary, and maybe even the tertiary Rider of each series, and leave the rest of the side characters as either upgrade/super forms, but even then there may be some cases which could slip through the cracks as well...