Alternate Character Interpretation: Matoba is really on Shinichi's side. The last scene of the anime consists of an Engineered Public Confession with the Queen standing right outside the tent where Matoba set up a video conference with his superiors. Considering that this would require Japanese technology, it is likely he was in on it to some degree since Petralka would not have been able to sneak in herself, her chief advisors and Shinichi's retinue into the heart of the Japanese camp otherwise.
Anvilicious: Prejudice is bad. Classism is bad. Equality is the basis of a good society.
Jerkass Woobie: Petralka starts off a Royal Brat (she gets better) being forced to rule since childhood and weighed down by the responsibility. She's still determined to be a good ruler for her kingdom.
Magnificent Bastard: Jinzaburō Matoba is a government worker in charge of subjugating Eldant through otaku culture via addiction and monopolization. Hiring Shinichi Kanou as a disposable pawn, Matoba endeared him to the Eldant royal family to establish his programs secretly intending to use it to take hold of Eldant. When Kanou learns the truth, Matoba breaks Kanou down by revealing him disposable if he defies the governments and when he does, Matoba sneakily covers Japan's intentions all the while setting up Kanou's many assassination attempts. When Kanou offers another way to maintain relations with Eldant without a full invasion, Matoba decides to side with Kanou believing his methods are far more effective than his superiors, fooling them into an unintended confession about their true motives and using it as blackmail to silence them. While an opportunistic bureaucrat, Matoba does what he believes is best for Japan.
