Farnese was helping Casca so she had a purpose and now she can do magic which is extremly useful. But Isidro & Serpico serve no purpose at all.
So Farnese's only reason to be in the plot is to tard wrangle Casca when Guts is busy

. Poor girl may be out of a job now then unless she steps up her magical girl repertoire.
Isidro was written for Guts to lighten up, and not just keep shoving other people away. Without him, there would be literally no other characters involved and that would have made for a worse story.
Serpico is there as part of Fernese’s character development, being siblings and all, that Miura clearly was slow burning.
I can buy Isidro, though I also see him as a in story representation of Mirua chilling the fuck down and winding down on the VIOLENCE, RAPE that was a lot more present in early Berserk. But Serpico has honest to god is just "there" and if Farnese wasn't needed to wrangle Casca, it would be a similar situation for her. There are slow burns, but they've been traveling with Guts for... what, 20 years in real time? Anyway, we'll never know, but I just think world building and art were Miura's strengths, setting up secondary characters with parallel goals to the main cast not so much.
The suckiness of MHAs ending was remarkable, and that's coming from a guy who dropped it a long time ago, around the time they introduced The Spiffing Brit as a villain. I at least expected it to meet the bare minimum to satisfy its audience of shonen fanboys (simpletons) but I was sadly mistaken.
And my god is it simple to do a "satisfying ending" for shounen. I love that slop. Give me an epilogue with the survivors having achieved something, close off some pairings and show me a 10 years later that their legacy is intact and I'm a happy camper. That this simple formula absolutely baffles a lot of creators is fascinating. Specially when both JJK and MHA had MULTIPLE epilogue chapters, I would have murdered for half that page count being dedicated to an epilogue in Full Metal Alchemist, Golden Kamui, Vigilantes or Nagatoro and looks like Oshi No Ko is on it's merry way to join the clan of shit with 3 chapters to go that feel like meandering.
I kept hearing people talk about how this was going to do everything Naruto did, but do it right and without blowing it or causing a bunch of past stories to be retconned into mush. Yeah that started being ruined once 2019 rolled around and gave Deku more fucking powers, and then again in 2021 when they did a whole bunch of other shit that really pissed me off.
Yeah, and I remember when I believed it... but "Batman knockoff" Deku onward is when the manga slammed into the ground and it kept digging underground ever since.
I love that show but it really was the right show in the right place at the right time. Bebop still holds up and I highly recommend to this day, but the reasons it’s so beloved for what it is is that it was essentially what kicked off the broader American interest in anime outside of the niche little community it had up to that point.
Very true. In my corner of the world anime wasn't as esoteric in those times like in the US. I had already watched a good number of OVAs like Dominion Tank Police, Macross, Patlabor or El Hazard as well as series like Dragon Ball, Evangelion, Slayers, Magic Knight Rayearth, Saint Seiya, Rurouni Kenshin, Berserk or Trigun and movies like Ghost in the Shell, Akira and multiple of the earlier Ghibli films (Laputa, Porco Rosso, Totoro) before I was even aware that Bebop was a thing . When I did watch it, I had already watched other shows of the time with long running narratives, so Cowboy Bebop basically being episodic except for like 3 episodes completely caught me of guard and I honestly never understood the veneration it gets. It's dripping with style, but I can only surmise that the veneration it gets is from "you had to be there".