[YuuHikari]

You know I think it would be a good idea to get the police,the goverment,and the military more involved in the story..eventually working with the museum to develop anti- extinct weaponry. And be just as or even more competent than Paleo at protecting the public, with Paleo starting of as an unrespected newb / guinea pig , who then eventually evolves into a someone worthy of leading the military to battle against an army of extinct.

As for the secondary, we could make him the stoic,reluctant badass normal who's comically forced by his bosses to babysit Ray and making sure he doesnt do anything stupid and teach him how to do his job while differing in values and personality. ( somewhat a mix of the classic rival and the friendly types). Eventually gets jealous of all the power Ray is getting which makes him volunteer to be a test subject for the new driver.

As for the Tertiary, how about a humanoid extinct taking the form of a dead girl it befriended (by possessing her corpse) hoping for a way to bring her back to life. who transforms into a kaijin-like rider form before getting a proper driver that gives her a more heroic rider form