Hmm, I wish someone knowledgeable would be willing to spare me thoughts/explanation as to why character A is sitting in top tier and why character B is sitting in the second tier and so on and so forth. Their backstories of why they are placed on their tiers, I mean.
Oh god, I will do my best with a tiny partial list.
God Tier
Middle
Demifiend from SMT: Nocturne
Defines what it means to be god-tier. Punches EVERYONE to death, has the ability to shape the universe however he wants. In the ending I consider canon for no reason whatsoever, he succeeds Lucifer as the lord of hell and becomes the ultimate lord of all demons, defeating all other potential gods.
Right
Protagonist from Devil Survivor 1
Turns out to be a reincarnation of Cain (of Cain and Abel fame), and ends up being able to become messiah of the demons, Lord Bal of the demons, or erasing them entirely.
Karma is a Bitch Tier
People more qualified than I can go into them
Power Overwhelming Tier
Right
P3 Protagonist
Defies the herald of death, fights for humanity to prevent their annihilation
SUCCEEDS (mostly), and his soul lives on a barrier between death and humanity. What a badass.
Extraordinarily Tier
Middle
Everyone's favorite P4 Protagonist
Saves a town (and maybe much more) from a malevolent Izanami by using his persona of Izanagi. Basically kills a Japanese god using another Japanese god. DBZ neckbeard power level is arguably higher with all his friends behind him (he did SOLO Izanami afterall), but he hasn't accomplished as much as the other tiers above him.
Right
Raidou Kuzunoha the 14th
Solving crimes and fighting morally ambiguous evil-doers circa the 20s. Still a student, pretty fantastic at his job, but may not even be the most powerful Kuzunoha (I think the Devil Summoner guy on the tier above him is an example). Kills Lucifer as an optional boss, but I don't think of that as canon. Doesn't necessarily save the world, but people are appreciative for what he does. Has his whole life ahead of him!
Normal Tier
Left
Devil Survivor 2 Protagonist
Mostly just along for the ride, hangs out with cooler people and fights aliens. One route involves him aligning himself with a mysterious person calling himself "The Anguished One" who sort of takes over and unofficially becomes the real protagonist.
Left Middle
Protagonist from Strange Journey
Mostly just a dude with an awesome looking helmet. Does his best, but is a pretty normal guy.