[Mesnick]

This is what recently occurred to me. It's quite a popular claim that Hibiki and Kabuto are not the main characters in their respective shows. But do not forget that the riders, with all the reservations, are still designed for children. And, if you look at children's stories, it is also quite obvious that Mary Poppins and Carlson, who lives on the roof, are also not the main characters in their books. And yet, it is also obvious that these books are named after them for a reason. Without them, these stories simply would not exist.
So I think Heisei's sixth and seventh riders should be treated the same way. Hibiki generally fits perfectly into the concept of “an ordinary child meets a magical mentor.” Kabuto is not so obvious, but Tendo and Mary Poppins clearly have a huge ego in common.