I think that person is talking about a twitter discussion about Eruri being an Erwin centric ship where Levi is mostly reduced to being his love interest and a side character and I am surprised by that discussion because it sounded like they were experiencing this for the first time while I strongly believe that it applies to every ship? I remember Zutara being extremely popular when I was a kid and it has always been mostly a Zuko centric ship. I have 2 other anime ships I am actually embarrassed of xD and they are like that, too. Eruri fandom has its issues imo (wasn't there a person who was "exposing" people for liking Levi more than Erwin like it makes them fake Eruri shippers hahahahaha and a small part of the fandom belittles and argues with other Levi ships) but in general Eruri fandom is huge and there are all kinds of people and fics and arts and actually this leads me to another question because it blew my mind, Lost and I'd like to know what you think but recently on twitter someone pointed out that Erwin's character changes a lot from Junior High to canon to other canon-ish materials and maybe I'm dumb but I just realized this but oh my god it's actually true. It's interesting that Levi and Hange and Mikasa and all other characters mostly stay the same while Erwin goes from ruthless to sweet dad jokes to playful etc how interesting! It makes me wonder what kind of person Erwin was before commandership weighed on him. Imagine young cadet Erwin meeting thug Levi xD

The first half of this Anon refers to this ask that I replied to recently. I'm going to break this down because there's a lot going on here.

While I agree that it's common for fans to have a favourite, I don't think that necessarily means that the other character has to be reduced to a "love interest" or "side character". Personally speaking I can't imagine shipping two characters unless I was fully invested in both of them. And when it comes to Erwin and Levi, if anyone is reducing Levi to a love interest and a side character then I'd suggest they're missing one of the main points of their relationship which is that it's mutual and equal.

No idea, though I suspect my block list is working as intended.

That I agree with, which is one of the main reasons I mute and block.

Exactly. This point can't be repeated too often. The fandom is large and diverse and people have very different opinions on characterisation and relationships.

I can't comment on Junior High because I've never watched it (one of these days I'll get round to it) but Erwin's character does evolve significantly from the start of the manga to Midnight Sun, and the supplementary materials, such as the official guidebooks and Smartpass content lend even more depth and nuance to an already complex character. This is partially explained by the fact that Isayama admitted that he didn't have a good grasp on Erwin's character when he first started drawing him. There's a very insightful interview with Isayama from 2016, translated by @darkcyradis, where he talks about his inspiration for Levi, Erwin and Hanji.

Levi has the easily understood moniker of “Humanity’s Strongest Soldier.” But Erwin doesn’t have anything of the kind. He’s the leader of the Survey Corps, is respected by all, and is an insightful leader.* That was my image of him as well, but on the flip side, that was all I had on him.

... for Erwin, there’s no person I can easily compare him to like that.

The main reason for that is probably because I didn’t have anyone in my life who was an “insightful leader” like my initial portrayal of Erwin. Of course, I’m sure there were people who were “insightful leaders” to a certain degree around me, but—and this is likely due to a quirk of my own personality—the grander a person, the more my eyes are drawn to the places where they’re frayed, or are coming apart at the seams.

Armin once said of him, “If a person existed who was capable of bringing change, they would have to be able to sacrifice things that are important to them.”

Erwin is certainly someone who can do that, but because I had no one in reality to model him on, and because I, the creator, had no shred of an “insightful leader” within myself to use either, I think I ended up making Erwin more and more human as I went along.

... Lately, though, I’ve started enjoying drawing Erwin. To put it simply, I think it’s because I am now able to write Erwin not as the “insightful leader,” but as he is inside my heart, an Erwin who is very complex inside.

I think we can get a glimpse of the kind of man Erwin might have been in Isayama's highschool AU where he appears rather sweet and dorky ♡