Niu, re SMT4: I can't really comment on how out of character people were, not knowing the other games too deeply... although I've looked at Nocturne boss fights on YouTube before the lulz, and there didn't appear to be a whole lot of depth there. Not that there's a lot of depth in Nocturne in general with its silent protagonist and not even properly melodramatic scenes when he fights his friends, because he's silent.
<NocturneFormerHumanClassmate> Hello let's see who is more powerful, our friendship is over, oh no you beat me, why didn't you adopt my goofy philosophy.
<NocturneBeelzebub> Hello I am demon, chaos is awesome, we must fight to see if you are worthy of my help.
<NocturneLucifer> But first, I must know the extent of the power of darkness you hold within. Behold the supreme power of darkness me, let's darkness fight.
Anyway Beelzebub is basically a non-entity in SMT4, so I suspect it's more a general demotion to random sidequest boss that would aggravate him. However, some of the SMT4 characters have the combination of "vast importance" and "tiny amount of lines" so I have to assume that we're supposed to fill in details from SMT1, even if SMT4 is technically its own universe. Stephen's the most obvious example - I'm still not 100% sure WTF he's up to and why in SMT4, but at least SMT1 plot from Wikipedia gives some context for why there's a teleporting magical dude in a wheelchair occasionally showing up and spouting off cryptic advice.
Also, even if it isn't exactly the same universe as SMT1, SMT4 clearly includes the same plot elements. As best I can tell, SMT4 is some wacky world where
the chaos / neutral / law endings to SMT1 all fired off simultaneously. It's neutral in that Our Hero saved Tokyo as a member of the Counter-Demon Force, but the lower half of Tokyo became an anarchist demons & gangster Chaos land, and the angels established their 1000 year kingdom on the roof. Our hero then reincarnates again shortly there after - it's 25 years Tokyo time since the trouble but he's 18 - and the angels somehow snuck an extra 1,000 years in up top, because that's how they roll. Yuriko constantly reincarnates because that's how she rolls. No idea why Stephen is still around and is buddies with a goddess but hey. The various characters met in the alternative universes are "Chaos Hero" and "Law Hero" basically in Kenji & Kiyoharu. In Blasted Tokyo the missiles hit because for some stupid reason that's what Law wants to do, in Infernal Tokyo it ended up being a chaos-led world by Chaos Hero.As a side note, there's a *little* bit of it, but SMT4 really needed a Yuri Hyuga type character to call the various villains on their bullshit. SMT series seems to want to pretend that, while crazy & evil, the Law / Chaos plans are [idealistic / noble / tempting]-if-flawed... when they're really not, just stick with crazy & evil. (Similar issues with, say, WA4 acting as if Lambda's plan is "Tragic Idealist Gone Too Far" rather than "totally batshit.") Look, Chaos supporters. Even if YOU think you can win a fight with invading human-devouring demons, all of your support network that gets you food and fixes your clothes and repairs your weapons won't. You're going to end up with the
Atlas Shrugged II problem once all the "weak" are eaten. Law supporters, you're mildly better, but you're total hypocrites, and I'd like Our Heroes to point this out. For the sake of peace and order we must kill everything, got it, or something. (To the game's vague credit, I do appreciate how it shows the "outsider" approach to Judaism and to a lesser extent Christianity - God has picked a Chosen people semi-randomly, and everyone else gets divine nukes dropped on them and are scorned, because. That is pretty scary and resonant, I'll grant.)