1. I want
Gojou Satoru, from Jujutsu Kaisen. Probably gonna be very high level.
Allow me to try to describe him...
He is not that powerful on his "raw" form, but his haxxes work in such a way that he can theoretically defeat any 3-D opponent vulnerable to them, often quite easily. His "Six Eyes" eye power has not been explained yet, but I'd give him an insanely high Perception stat given that he appears to see clearly even with a blindfold on (sic) and can bypass insane levels of stealth, instantly identify someone through their aura and easily understand someone's powers through it.
His main ability is Limitless, from which the rest of his haxxes derive. He manipulates space at the atomic level and creates weird, should-be impossible scenarios. Infinity, the basic defense form, is based on the Achilles and the Tortoise paradox in which if you keep cutting the distance between two points by half, they'll never touch: there is an "infinite" space compressed around him, and any attack that comes near loses speed at an exponential rate, seemingly stopping before ever reaching him. You cannot touch Gojou Satoru without some way of dealing with his spatial hax, or some infinite speed, or whatever else. This means even if you believe Saitama to be able to one-shot any 3D opponent, Saitama shouldn't be able to do anything against Satoru. This is semi-passive because it's controlled semi-consciously: he doesn't need to think about it, but can to reprogram it or create exceptions/additions if he wants.
He then has his main two techniques, Blue and Red. Blue creates a gravity-like attraction to suck stuff in, while Red repels stuff intensely and can be twice as powerful as the most power he can put on Blue. He seemingly reinforces his basic attacks with Red, since all of his opponents keep saying "It's not just an attack reinforced with Cursed Energy!" when taking blows from him.
When he fuses Red and Blue together, he creates a space in which the laws of physics don't work properly and shoots it off like a blast. It's not known yet whether the effects of this blast are pulverization, vaporization, atomization, sub-atomic destruction or existence erasure, but it's almost certain it involves a ton of Durability Negation.
He can also use Reverse Cursed Technique to heal himself, and he can heal even from severe brain damage. He's constantly using it on himself to preclude his own braindeath from being using Limitless all the time. Also, his Black Flash is kinda like a critical hit in which he has the chance of dealing over 2.5x his normal attack potency when landing a crit, so I think his critical hits should be Black Flashes and be stronger than normal criticals. I dunno, maybe instead of two times the damage he'd do, he gets 2.5 times the max damage from whichever attack he used when critting?
Satoru generally gives a very chill vibe, is smart and almost always relaxed, VERY confident. He used to be a Chaotic Neutral "I do what I want and don't have to help humanity" type when younger, but matured after some events and became more of a Chaotic Good type who wants to do good and doesn't care what others think or what the rules and traditions are, merely playing the game to the extent he needs to/it helps him.
He's currently listed as
7-B but might be getting upgraded to
Low 6-B or
6-B soon. His speed may also end up getting a buff on the future. Combine that with his regen, crit buff and all that hax and versatility, and he's probably getting a really high Challenge Rating... wouldn't say max challenge level or anywhere near it, but only because D&D has its fair share of overpowered mobs.
Also, I dunno if I can just list stuff, but here are some beings that I think would be AMAZING mobs for the game:
2. Goombas, Koopa Troopas, from Mario Bros. You most definitely already know them, no need for details.
3.
The Pursuer, from Dark Souls (A boss/miniboss that can become a minion at higher levels! Remember they die with two shots from a Balista, so they shouldn't be that overpowered). He's a relentless giant and aggressive knight, a heavy hitter with the player as a target he'll keep pursuing until one of them is gone for good. He wears thick, full plate armor and wields a massive sword and shield on top of that, both of which he uses to attack. He's slow, but each of his attacks are very potent (and he can still go for a three-hit combo, so he shouldn't be thaaat slow). He can also create a shockwave by stomping the ground and shoot dark magic orbs, so he's not strictly made out of physical attacks! Basically a very menacing opponent who however can be cheesed if you don't let him destroy the balistas first. He's strong against poison but not invulnerable to it (merely resistant), and weak against lightning, possibly because of all that metal armor.
Given that the protagonist is "at least 6-C, possibly Low 6-B" and "Massively Hypersonic+", he should scale to that, though I don't know if you'll make him scale all that much.
