Broken Base: Big time. Some fans appreciate it for being akin to the darker parts of the Showa Era, whereas other fans despise it for being TOO dark, pointing that in comparison to entries like Kamen Rider BLACK, the film goes too far.
Iwao Himuro is the paranoid head of the ISS. An uncaring, heartless Bad Boss to his employees, Himuro considers those who refuse to cooperate with his projects as his own enemies, and has them either assassinated or imprisoned. Using his facility as a front for human experimentation, Himuro plans on obtaining financial gain through the mass production of super soldiers to be sold to the military industry. Forcing Shin's father to continue the research after having his former partner "resigned", Himuro denies his permission to not get his son involved, explaining that it was "too late for that". Armed with a submachine gun, Himuro guns down Ai, Shin's pregnant girlfriend, when she takes the bullet for him.
Giichi Onizuka/Onizuka Rider is one of Himuro's top scientists and secretly a misanthropic Serial Killer. Harboring an agenda of his own, Onizuka sabotages an experiment, altering both his and Shin's DNA, seeking to create an army of human-grasshopper hybrids to overthrow humanity, with him as their ruler. He wants Shin to be his first recruit, once trying to convince him into embracing his violent side. As a Cyborg Soldier Level 3, Onizuka regularly commits murders around the city For the Evulz, primarily targeting lone women. Introduced brutally killing a woman in the middle of the night, Onizuka proceeds to cut the throats of two undercover police officers investigating the slayings, and slaughters the cops who had arrived at the scene. When his secret lab is invaded by the CIA, Onizuka nearly kills the entire squadron, and tries to repeat this when he is indirectly released from containment by a group of agents.
Cult Classic: Shin's fondly remembered by fans of the movie...which doesn't say much.
The Woobie: Shin, full stop. He gives up his dreams of motorcycle racing to help be a test subject to cure incurable illnesses, only to be manipulated, mutated, and have everything torn from him, his loved ones included, and even his very child is treated as a mere weapon before its even born. Nonetheless, he pushes on, no matter what he faces.