I like Fern. He's interesting. I don't know where that one post I made about it is - I think it's sooomewhere in the E15 discussion, but I'm too lazy to find it.
Edit: Shit, that's a wall of text.
I really, really don't think that Fern is going to keep up his behavior for the whole rest of the story.
Now, I do agree that it's unlikely he'll suddenly turn around and be a friendly little sweetheart, but the trope "Good Is Not Nice" exists for a reason.
I think Fern is perfectly capable of coming to his senses about what side he should be on, and still be a jerk. Not everyone who fights for the same cause as you will always be your friend, or even a likable person to you.
With Fern, I always feel like there are two main issues for him.
First, he always, always gets overshadowed somehow. First by Florinia, who he is "only" the reserve leader for, and who appears to have been hugely popular during her trainer school days (more popular than Fern?), and later by the player, because no matter what Fern does, not only do you easily catch up with him, but you're also the one who gets sung all the praise.
Of course, we know that people don't like praising Fern because of his bragging and the way he insults the people he battles against, but everything about his attitude just reeks of someone who is very desperate for attention, to the point where he doesn't even care any more if it's good or bad attention.
At the end of E15, even Solaris compliments the player on their battling skills and shuts Fern down. I mean, wow, that must suck, especially when Florinia scolds him in front of everyone.
Second, whatever it is that happened to Rini, it affected him more than he's been able to handle.
There's a moment in E15 that I find especially memorable:
I'm not sure what I want to think happened during the Onyx School days of the leaders, but whatever happened, we know that Florinia felt deeply hurt, and decided that "shutting down" (probably more like, forcefully suppressing) her emotions would protect her from hurt in the future.
She's playing the role of the emotionless "Flobot" to keep herself out of more harm's way, but everyone else around her is left to deal with the change by themselves. Julia tries really hard to be the same as ever to her, she doesn't want to give up on her friend and I believe she refuses to accept Rini's current "situation" as the endgame.
Fern is effectively telling us in E15 that he feels like he has lost his sister. We don't know how their relationship was prior to the incident, but with Rini's decision to suppress her emotions, she made no exception for Fern, and treated him just as indifferently as everyone else.
We see it as early as during out first strike against Meteor - she "allows" Fern to be as dangerously reckless as possible (during the convo where she tells the player to stay safe). Of course he's already not being very nice to her at that time, but I can only imagine what it must have been like for Fern to watch his sister change so completely, never resolving the incident that hurt her, and refusing to deal with the consequences.
Rini refuses to consider the consequences, instead insisting that it's irrational for her friends to still be emotional about everything.
I don't know if Fern is so desperate for attention and recognition because of the situation with Florinia, or if he's always been someone who likes attention and everything's just been made worse by what happened back then.
But to me it feels like everything Fern does, from being outrageously arrogant and condescending, to joining Team Meteor, is a giant cry for attention.
He claims he joined Meteor so he can have his "rightful place at the top", and I feel like he is simply trying to create a situation in which people are forced to give him the recognition he can't seem to get from them otherwise.
Is he an immature dick for it? Yes. But I very much think Fern can come to his senses if only the problem between Rini and Tania would be resolved properly after all those years. Give that poor boy his sister back, maybe that'll be a start to helping him be less of a jerk.