Ryuki so far has the most number of Kamen Riders in one show. Now moving on... and I'll include the two possible fates provided by Kobayashi and Inoue. Shinji Kido/Ryuki- As the main character, I would say he's pretty much idiotic, idealistic yet he has noble goals. Hmmm with his position as a journalist, I thought of him as a parody of Spiderman in some way. So he and Ren just keep getting into squabbles because of his idiocy and the other is a jerk. For a character, I thought he always has his moral dilemmas and his reason to be a Kamen Rider is nothing personal, he just wants to protects people from the threat of the Mirror Monsters. So a pretty tragic hero to the point in the original continuity, he even died after fighting despite all his injuries, in the "second chance" timeline he becomes an idiot again. In the alternate ending by Inoue, he and Ren don't forget each other and decide to finish the last remains of the Mirror Monsters together ...
My critiques on selected East Asian drama and movies but don't expect SJW-friendly series reviews... =P