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Dethroning Moment: Digimon
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Deeman45: The main characters' hopes and dreams have nothing to do with their personalities at all. Matt, the angsty Lancer who was a budding musician in a teen band? An astronaut! Joe, whose Character Development in the first season revolved a great deal around realizing that forcing himself to be a doctor because his dad wants him to isn't right? Guess who's wearing a stethoscope?! Yolei, the perky and somewhat hyperactive girl who was probably the smartest female in the main cast? Someone's a housewife! And Davis—main protagonist of the second season, who led the effort to save two worlds from an abominable evil—ends up running a noodle cart. A fucking noodle cart. Do you respect your characters at all, Digimon?!
Demon Damian: To me, the worst was the episode introducing the Daemon Corps. Aside from They Wasted a Perfectly Good Plot, we had been getting a lot of hand waving as to why Angemon and his evolutions had been so thoroughly Nerfed (because he's supposedly only powerful/useful against "real" Digimon that are dark/evil type). Enter SkullSatamon, an Ultimate Level fallen angel Digimon, who should be easy for MagnaAngemon, who once defeated a Mega level, right? Nope, he was curb-stomped like the others, and he had to give up his powers (alongside all the other Digimon) to power up Imperialdramon. Yeah, the whole thing was just an excuse to give Imperialdramon a stronger mode, making all the other Digimon pretty much useless in every subsequent battle.
Emperordaein: This was a decent series at first. Not as good as the others, but was still a decent enough show. Until they brought in the abomination known as the Royal Knights saga. Not only were the remainder of the cast sans Takuya and Koji screwed over, due to Takuya and Koji's transformation taking away all their spirits (which was really unfair to Kouichi as he only got to use his spirit for about three episodes), but then those same people were smashed into the ground by the Royal Knights, who effortlessly beat them in the same method for eight episodes in a row (and the Royal Knights are very obnoxious characters, at least in the dub). And yet this wreck had a DMOS within it! The final battle where the heroes are defeated even quicker than before. This just destroyed the entire series for me.
Ajustice: The way they dubbed the final episode screwed up the emotional scene between Henry and his dad as the Digimon had to leave, it made it so that it seems Henry would forever resent his father when the original Japanese had Johnu telling Henry that he doesn't deserve his son's forgiveness but Henry assures his dad that he does forgive him.
Rem Tar 85: To me, Tamers was beyond ruined with Leomon's death and everything to do with it. First up, it fails at trying to be shocking, instead basically becoming an unfunny and predictable running gag. Second, it kills Juri's development in becoming more strong and confident, being hit with the death of yet another person she holds dear, this time right in front of her eyes, and is basically reduced to a damsel in distress for the rest of the series. And third, and possibly the most infuriating thing, how everybody pretty much just goes out of their way to bring Impmon back and forgive him so easily, just because "friendship" and all. But he was never their friend to begin with, he was always a little douchebag who put their lives at risk. When he became Beelzemon, he practically became a remorseless killer. Not only does he kill Leomon and taunt them about it, he tries killing them all with no mercy, shown especially when he shoots and almost kills Kenta, the only child who at that point had no Digimon partner to protect him. All of that stemmed directly from Leomon's death, and it all amounted to one of the biggest DMOS's I have ever seen.
Man With The Plan: The Grand Finale is worse than the ending of 02 and the Royal Knights arc of Frontier put together. It turns out that all the past Digimon heroes coming together was overglorified Fanservice for the anniversary of the franchise, since they're all rendered useless by the final battle. Taiki, the hero of the past Xros Wars seasons, gets knocked out by a cheap shot from Ryouma and Astamon once Ryouma reveals he's working for Quartzmon, so he gives his goggles to Creator's Pet extraordinaire Tagiru, in order for him to take his place. Then Astamon is revealed to have been Quartzmon all along, something that was barely foreshadowed and causes Ryouma to make a Heel-Face Turn because he realizes Quartzmon was using him all along. (Uhh, weren't you consciously choosing to help Quartzmon anyway, Ryouma? Shouldn't your partner Digimon being Quartzmon all along make things more convenient?) The past heroes then all give their power to Tagiru so he fights the final battle with Quartzmon alone. It gets to the point where Quartzmon has Xrossed himself with the entire earth and has absorbed the souls of every living thing, so it's up to Tagiru to save the universe on his own, making him an outstanding example of a God-Mode Sue and Black Hole Sue. And his motivation in all this? "Defeating and hunting Quartzmon will make him a true superstar?" What about all your friends, loved ones, and the world you selfish little shit? And after Quartzmon is defeated, the series ends abruptly with no true sense of closure and a few things left hanging too! So basically, They Wasted a Perfectly Good Plot in order to show off this flat, unlikable character reminiscent of a self-insert fanfic Mary Sue, and secured Young Hunters place as the worst Digimon series ever.