These concepts are quite interesting, Gearbox hasn’t really ever made Borderlands DLCs that revolved around the currently playable characters plot-wise, yet. Although, they actually pulled it off really well with Battleborn story operations, so I would be curious to see if they could figure it out for this franchise too.
Out of your ideas I really like the Amara one (Partali and its criminal underground could be fun to explore, and it’s always interesting to see places that were previously only mentioned), followed by Zane’s (good setup, ties neatly with what we know about the Flynts, and might deepen our knowledge of this family), then Moze’s (sounds a bit generic) and finally Fl4k’s (it doesn’t really seem well connected to their past, and I’m not particularly into a third Crawmerax).
It might also be intriguing to play similar quests but set in the past, perhaps through some Claptastic Voyage/Fantastic Fustercluck/Attikus and the Thrall Rebellion style shenanigans.
Now, my ideal new season pass would probably have the same base structure as season pass one: four campaign add-ons and a few additional things sprinkled between releases. Assuming they want to keep big plot threads (the Creator, the seventh siren, Elpis, the war) and major character returns (Fiona, Sasha, Loader-bot, Gortys, August, the Watcher, Athena, Janey Springs etc.) for future projects, these are the base elements of what I would include:
CAMPAIGN ONE: CLAY AND THE ROGUE CRUSADE
Clay and especially the Rogues feel really inconsequential to the BL3 story, their whole quest being little more than filler. This DLC would try to somewhat retroactively fix that by using the whole Going Rogue mission as a setup. This DLC is basically a rogue-centric, planet hopping smuggling adventure that Clay asks you to join in, in his quest to reform the Rogues (after the recent losses). Domino and Agent Double D come back. Instead of the expansion only being set on a single planet, the new hub is actually the Rogue’s ship, and you use it to visit various locations (so each one of them wouldn’t really be as fleshed out as vanilla ones but they could still be intriguing, a bit like Athenas). You might visit towns born from mining sites in asteroid belts, or encounter space pirates inspired by the ones cut from Luxy’s DLC, or abandoned hovering platforms in the upper layers of gas giants. You might also stumble into Kitru, Zane’s old acquaintance.
CAMPAIGN TWO: RED TIDES AND BLACK STORMS ON JUNPAI-7
This DLC is set on the ocean planet of Junpai-7, in a mysterious, lawless, Bermuda triangle-style region. According to a recent study, the dangerous anomalies that plague this sector might actually be linked to a great concentration of seraph crystals…but this obviously attracted a lot of people from around the galaxy. There you also meet up with Eliza, who needs your help in watching over a grown up Pickle, who foolishly ventured into the stormy sector. Captain Scarlett also shows up, looking for the crystals. We get actual boats as vehicles for the first time in the series, as well as rudimentary surface swimming mechanics that get replaced with floating above water through a hoverboard of sorts after some progress. This DLC also finally explains what seraph crystals are.
CAMPAIGN THREE: EPIPHANY OF THE FORBIDDEN BROTHER
Aurelia mentioned that she left on a poisonous gas on an entire planet. You go there (for some reason) and find dr. Ted, who plays a frenemy kind of role inside the add-on. You also get a dr. Zed cameo at the end of the DLC.
CAMPAIGN FOUR: PATRICIA TANNIS AND THE ARK OF THE ERIDIANS
Tannis finds a new solar system, which has remained hidden up until now due to the fact that its star is completely enveloped in an Eridian dyson sphere. As you explore, you actually find out that the sphere contains a lot of unknown samples of alien DNA and tissue, presumably coming from planets and civilizations that have been wiped out by the Destroyer centuries ago. Although, some acolytes of the Destroyer (of a dubious species) seem to be on a quest to destroy every single one of these. You help a lonesome sentient guardian, the Preserver, to get rid of the invaders once and for all and save as many of the left samples as possible.
A takedown against a vault monster who has been ravaging an unhinabited planet for who knows how long, as you find out who actually might have opened its vault millennia ago, perhaps a predecessor to all vault hunters.
A sort of trial against the whole Traunt family. I know it’s borderline sh*t-post, but it could be fun.
I’m aware that a lot of these ideas suck and/or are underdeveloped, but it’s just fun spitballing and wishful thinking.