Abandon Shipping: This has rapidly happened to Ginti and Mayu shippers after he sends her and Harada to the Void in episode 11.
Alternative Character Interpretation: This is a major theme of the show. After every judgment, the viewers are left judging the characters themselves and wondering if the players truly deserved their fates or not. It seems the only players who are safe from this trope are the ones from episode 3, and Chiyuki herself.
In the very first episode. Is Machiko a conniving, manipulative Gold Digger who coldly cheated on her husband and used him for his money? Was she impregnated by another man? Or does she put up a facade because she can't stand to see him so distraught over the fact that he inadvertently caused the death of the unborn baby he wanted so badly to protect, and wants him to rest peacefully? Turns out it was probably the last one. Unfortunately, the guy supervising her case wasn't a very good judge of character.
Episode 4 with Misaki. People seem to be torn between viewing her as an Asshole Victimwho deserves to go to the Void or a Jerkass Woobie who should have been reincarnated. Further, whether she truly loves her children or is just putting them to good use has been debated; while her last wish isto be sent back to see them again, she does call them "utterly weak" when they are of no help to her in the game. However even that has an alternate meaning, considering one of her flashbacks shows her hanging around in a arcade. The children are utterly weak for a super attack.
Whether Mayu is a shallow fangirl who's perfectly willing to toss some random guy into the void despite knowing how terrible it is down there, or whether she's a sympathetic portrayal of someone who devoted her life to something regardless of how shallow she seems, and then embraces those feelings and accepts herself, yet remorsefully casts that man into the void to save her beloved.
Ginti gets the most of this due to being a recurring character. Does he do Mayu a service by casting both her and Harada into the void together and (seemingly) allowing their souls to merge so that they'd never be alone? And if that's the case, does he do it knowing that would happen? Or is he just a Jerk with a Heart of Jerk through and through, manipulating her and then mocking her perceived weakness, and deceiving her by lying that she can replace Harada's soul with some stranger's if she pushes the red button... only to send her into the void anyway, which is a place of eternal suffering?
Awesome Music: The infectious, toe-tappingly catchy OP, "Flyers."
Ensemble Dark Horse: Mayu, for being an absolute barrel of laughs and a complete joy to watch despite only having focus in one episode other than her judgment one.
Decim/his assistant is the most popular ship, despite never getting together in the end, with many fanfiction being based around reuniting the two.
Ginti/Mayu had a good following due to their humourous interactions and was seen as a good Beta Couple to Decim/his assistant, despite Mayu being obsessed with her favourite idol Harada and Ginti showing no romantic interest whatsover. Ginti's actions in episode 11 caused most to jump ship, though.
With Psycho-Pass, especially on Tumblr and Twitter. Both are fairly dark shows that deal with human psychology, have a male/female protagonist combo that complement one another well, and attractive male charactersin suits. Death Parade started airing shortly after the second season of Psycho Pass ended, so it seems a lot of fans of the latter moved on to watch it.
Germans Love David Hasselhoff: Death Parade sold poorly in Japan and scored low in niconico's polls. However, outside Japan, it's received considerably more love, often being rated as among the best of the season.
Jerkass Woobie: Misaki from episode 4, while definitely a rather unpleasant person, to the point that her agent snapped and killed her after what's been implied to have been a pattern of using her as a punching bag also clearly had a life that sucked. She's had 5 children by 3 different men, all of whom were abusive, and her life has only just begun turning around by the time of her death. What's more, while it's implied she's been neglectful to them as a result of pursuing her entertainment career her distress upon realizing she'll never see them again appears genuine.
Clavis and Castra are recurring characters but they contribute little to the plot and very little is known about them.
Oculus is the closest thing the antagonist has to a series and the closest thing to 'god'. However, he almost exclusively interacts with Nona only and doesn't take action until episode 10. Ultimately, despite his debate with Nona about the Arbiter system, he does nothing to Nona or Decim and the series ends with simply him keeping a closer eye on Nona and implementing a fourth rule to prevent the living from cooperating with judgements.
While the implication of one being compared to heaven and the other to hell was always there, the ambiguity of what reincarnation and the void actually entail was a large part of "Death Billiards"'s intrigue. On top of no characters commenting exactly on what either judgment means, most of the people being judged are often very grey. Is the void true nonexistence, or just infinitely boring? Does Death Parade subscribe to Buddhism and argue that reincarnation is the choice that's closer to punishment? Or is neither really "good" or "bad", but just different? This all gets torpedoed in episode 11, where Ginti states that the void is a permanent state of falling into an abyss where you feel all your negative emotions at once. So it's definitely the "hell" option. That said, he could've been lying in order to push Mayu into a choice.
There are a lot of details about the setting that are set up and ultimate unanswered. This ranges from the fact god hasn't been involved in things for a long time to questions of who set up the Arbiter system in the first place.