Thread:Aldo The Fox/@comment-32868415-20170907121327/@comment-5951231-20170909015558

They are all prototype mass produced armors created by the Smart Brain Corporation and never made it into the show because it was just concept material made by the show's suit designer Tamotsu Shinohara.

Based on the concept notes:

Pyron was a suit used less for combat and more as a kind of sporting outfit for motorcross and other extreme sports.

Seeda on the other hand was an armor used for work, mostly rescue work and for military forces and law enforcement. Since Smart Brain is a corporation, these models would have been a way for them to maintain their business by selling the suits to interested parties for profit.

Neo-Alpa was a failed model of the Rider Gears, as it never went into production. But it has components derived from Kaixa's system, such as a variant design of the Blaygun weapon. Its purpose was for combat like the other Rider Gears to protect the Orphenoch King.

It is curious you are doing a school report on Kamen Rider, hope it turns out well!