On RWBY, The Amazing Digital Circus and Toxic Indie Fandoms...
Fans of cartoons, animated movies and animation in general have a... bit of a complex. Largely when it come to snubbing a new movie and/or show for not being just like what ever the standard bearer is at the time. A mentality that really hurts critical discussion than help. Like... getting mad at, say, Big City Greens of what Disney pulled with The Owl House is just not cool.
I find it happens a lot with Animation Twitter spaces being all about taking Disney down a peg be it because Spiderverse or Puss In Boots (take your pick at this point). Though in that case, it's a case of one-up-manship getting way too out of hand since there's at least a vocal push back.
With RWBY being pitted against every other indie animation, it's actually not too much of a unique case.
It has been a small scale project getting massive amounts of hype from the pilot (or Trailers as with RWBY's case) only for the show to come out and split its pre-established audience down the middle.
This split starts and widens when it comes to how a character may be initially presented only for more facets to them to be revealed. It should go without saying buuuuuuut the creative team are not mind-readers. Even the most popular of fanworks will inevitably NOT reflect what the show will develop into whether they come close or not.
However, that investment in fanon is liable to clash with what canon goes with. Some fans take it is stride and are willing to hear the showrunners on their direction. Others... take it personally.
Maybe a character that seemed mean but wronged turns out to be a very shitty person.
Maybe a character that seemed shitty has some hidden depths beyond how they initally came across.
Maybe the story is taking a turn that, well, had precedence but feels alienating to those who preferred the previous status quo.
Maybe the pacing feels off with certain reveals that may be a skill issue on the writer's part.
The issues may vary but a lot of this comes from a sort of "bigger they are" type of backlash with a lot of specific expectations formed of the story before there even was one.
Now this might sound like RWBY but... a lot of them were inspired by the polarized comments of Helluva Boss Season 2.
It happening to Vivziepop.
And let me tell you, it WILL happen to The Amazing Digital Circus even if it has a limited run planned.
A character will become more than just some fan's blorbo for better or worse and said fans will loose their shit.
A ship will sail however much they wanted sunk.
No matter what, there will always be ONE FAN that will be pissed off.