It's easier to get a grasp of the scale by going by the implied cosmic hierarchy and downward.
0. God
1. Outer Twins
2. 6 Arbiters
3. 12 Apostles
4. Qliphoth, Great Ocean and other Gods
5. Chosen, Natural Level 5 Superhumans
6. Level 5 Superhumans, S Class Monsters
7. A Class Monsters, Level 4 Superhumans
8. B Class Monsters, Level 3 Superhumans, limit of human technology and weapons
9. C Class Monsters, Level 2 Superhumans, Peak Humans and others with weapons (monsters or tech)
10. D Class Monsters, Lvl 1 Superhumans, Trained Humans in certain situations
11. E Class Monsters, Regular Humans
Outliers who don't really fit in their appropriate tiers are those like Deus, MC, Henri and Duncan. Mostly because it's implied that some of them have unlocked the original traits or at least have dual traits. Deus in particular was said to completely dwarf Nico in power by Valravn, while only being a Level 4, according to Lisa. Duncan has power on par with Level 5 Superhumans. Being able to one shot A Rank monsters at Level 3.
Origin MC is the tricky one. His powers are incomplete but seeing as he claims to have power beyond the 5th evolution, he should be around the same level as the Qliphoth. Being able to connect to his higher plane to give himself near limitless power. The problem then is that if you sever his connection, which Bernhardt is implied to have done, he's not much of a threat. Around Natural Level 5/Chosen level. Deus likely did something similar as well. Whether it be going back in time to sever his connection or going to the Immaterial world. Which we know Deus can do as he's a Time aligned superhuman. One of the powers that have influence over the Immaterial world.
That said, this list doesn't mean everyone else is equal within their tiers. Some are higher while some are much lower. Nyx, for example, one taps Ella and a bunch of others in the Level 5 section. Then there's Eisheth, as a Chosen, who's way below Malik and Bernhardt, the natural Level 5 Superhumans. This is even while being in her true form. Likely landing around Lexi and Nico tier. Lexi specifically being in the middle, power wise, for the Level 5s at HERO. While Nico is just below the Captains (+ Henri and Deus) in power. Lisa being the only other Lieutenant with more internal power than her. And even she can't beat Nico.