What would his skillset look like with only non-fusion Personas?
Fusion personas are still unique to Minato. Throwing them out seems, again, arbitrary nerfing.
In this case, he is able to immune just about everything, has good stats and skills, and all kinds of stuff. Still has initiative. Not quite Bluelike but definitely a great Godlike.
With only 'storebought' Personas?
...storebought...personas? Did you play the game? All personas are either storebought or not depending on how you look at it. You can buy them in the compendium IFF you've gotten them from a random drop first. This interp doesn't even make sense.
What if he could only pick one Persona per battle?
Come in with Lucifer, initiative, Armageddon. This doesn't change him at all.
The Orpheus-only option just struck me as having the highest precedent. Like how Golden Sun characters just get all of the Djinni of their respective element, despite being able to equip -any- Djinni, or how FFVII characters get their starting Materia at max levels for their only Materia options.
I think you're missing the point. Those are done like that
because everyone in the cast can equip these things. They aren't unique, therefore, not allowed.
Finding a suitable 'interp-range' just seems better than throwing him out off-hand.
This is kind of misunderstanding what an interp is, I think (or I am, in which case I apologize in advance). When you interp a character, you figure out how you see a character by what rules you've already set for other characters in the DL. You don't change interps from character to character. Allowing Fei Yamikei even though it's past endgame levels, but not allowing Minato past endgame levels personas, for example. If you allow Yamikei, you allow the overlevelled personas. You don't decide "oh, Yamikei isn't broken so I'll allow it but Minato's overlevelled personas are so I won't". It just doesn't work that way.
Above all, the DL, the one thing views should have is consistency. What you're suggesting is to take Minato with a view that is NOT consistent with how lots of people view the DL. If it's consistent with your view, fine! If it's not, shame on you.
Though it's still silly to limit him like that. The only limitation which really makes sense to me is not giving him personas above endgame levels(Which in my case at least meant no Armageddon, but this would obviously vary for others) As far as I know, the only persona that nulls everything is NG+(Or at least so damn hard to get on the first run that it might as well be), so while he is certainly tough to beat, it's not impossible as long as your skillset is varied enough.
Just noting, if you don't allow Minato's overlevelled persona, you better not allow Terra's Ultima, etc.
And you can fuse a persona that nulls everything but Almighty in the maingame, IIRC.
Moonless Gown would get the same general treatment that boss invincibility moves usually get: A one turn break in between using it. It's how Berle isn't our best dueller and such. Nyx...is certainly more rankable than Minato, but as we've seen, those multi part SMT bosses with shit HP in between forms can be problematic. P3 isn't going to have the best of draws, and the general type of dueller Nyx is would likely only fit with a killer draw (Because it would be seriously annoying with those mass of build up shit forms that could serve as spoiler to a lot...although not too many if someone has decent physicals and magic, I think).
For one thing, I didn't even know about this "treatement" of boss invincibility. Is it really that common or just your view? I'm curious.
Honestly, I'm not sure how to treat it, but "one turn break" sounds kind of arbitrary.
Also, note that Berle is from an ARPG game. He doesn't actually get "turns" in-game. So you can just view his invincibility as wearing off after he acts, and therefore cannot be reapplied until his next turn. There's not really an indication otherwise, IIRC.
As for Nyx Avatar, when it wears off is clearly indicated (it takes up his turn, actually, but he doubleacts). As such, I'm not inclined to arbitrarily nerf him and say he has to wait a turn. Unless I was to go the "boss must always follow AI always" route, in which case... he can still spam it sometimes but not always or something.
I'd have to think on this some more I guess.
And according to Pyro, Night Queen pierces full status immunity. I think you can null single statuses of it normally though. So Nyx Avatar is still pretty much unrankable anyways.
The fact that 'every Persona in the game is unique to Minato' is almost an argument against in my mind. The Persona fusion/evolution/switching feels more like it's a part of the game's system than anything inherent to Minato himself. This is especially true when you look at FES, where Aigis can do the exact same thing. It's just that whoever is the main character gets to evoke lots of different personas, it doesn't change the fact that Aigis' main alignment is The Chariot, just like Minato is still primarily tied to the Fool personae (And Thanatos\Messiah, I suppose).
I'm sorry, but bullshit.
Read the plot. The game explicitly says that this is Minato's power. That no one else can do it. Aigis inherited the power in FES.
If there was no plot backing, then maaaaybe you'd have an argument (though I doubt I'd buy it anyways, since a lot of games have unique mechanics that are allowed in the DL, though I don't know how many apply to single characters).