Ok I’m beginning to get a coherent picture of what Era is going to be in-story and it’s actually pretty hilarious
In each different character story I’d had this idea that Era would appear as a somewhat remotely-located sidequest you could find if you looked around a little bit and he’d just be hanging out in some weird, bizarre form kind of mostly blending in with the aesthetic of the character and their homeland/story but in another way still looking pretty damn weird
And the thing is, Era understands on a basic level what the character is about and wants, but not entirely/specifically (and also actually wants to mess with them a little). So, he gives them a proposition that vaguely seems reasonable if you know nothing about the character (which you will by the time you find Era, enough to realise this is all wrong and he totally doesn’t get it)… but which even so if you let sink in for just a second you realise is completely, insanely ridiculous.
The character can fairly well tell this is bullshit and ridiculous, but as Era keeps talking what he says almost starts to sound like it makes sense, to the point they can decide to go with him. If you do so the story goes off into a weird ending/short fork where they go do the thing and just as the character suspected it was not quite satisfying. You can also say no though, in which case their story proceeds normally and if every character encounters Era but says no it unlocks Era’s story where he gets to be a main character like the rest of them. I’m not sure what will happen in his story but I do get the feeling he’s one of those characters that will always just be kind of mysterious. With all the other main characters there may be some degree of mystery but before long you learn about their motivations and who they are. Era? Not so much. He has a personality and story, but he’s also just kind of a thing that exists, that does things for “reasons”.
I do know if the characters meet up (idk how many) he’ll appear to them and join them as Erasthemus Errator. Which really honestly is his “humansona”. He literally created it because he thought humans were an interesting species and wanted to make one. Also they may end up fighting the bosses and/or fudging up the aether just because the bosses know Era is a Bad Thing they need to get rid of and aren’t gonna let some group of clueless/audacious young adults just be pals with him, and probably at any given time the whole aether’s gonna be trying to get rid of him to an extent, Insulators for one have very little tolerance of strange and threatening things that aren’t supposed to exist.