For the sake of consistency, and for in-universe reference for superhero (and villain) registration. Every character is assigned a rank from X to F based on their overall power level. Some rankings can be sort of subjective, since superpowers are so varied, but as a general rule two D rank characters would be an even match for each other if even if they had very different sorts of powers. This includes ‘powers’ bestowed on a character by gadgets or armour they use in their superhero (or villain) ing.

Power levels are ranked in terms of how much damage a character is currently capable of doing (or how much of an effect they are able to exert, if their power is not physical) – intentionally or not. A character who has no powers but has extensive training and experience in hand to hand combat would most likely have a lower rank than a character who can generate extremely powerful lasers but can't control their ability to do that.

When determining your character’s power level, you may need to pick something different from where they’d be classed in canon – not every single supervillain can be the biggest and baddest ever, and on average teenage superheroes aren’t going to be among the most powerful ones even if they’re the hero of the series they come from. Conversely, you may want to power a character up a bit if you’re putting them in a position of superheroic authority and renown when in their canon universe the bar for badass is set a little lower.

X: This is for super strength that can move planets, reality warping that can rewrite an entire universe, mind control that can mindwipe thousands of people at once unassisted, or actual omnipotence. Not many characters are or will be X rank, and nobody will be allowed to app characters as X rank at the start of the game. You probably do not have high enough clearance to know about this rank. People are inherently troubled by the idea of this class’s existence.

A: The best of the best so far as super beings that do not inspire considerable existential dread. This is the rank for heroes that not only have been blessed with extraordinary abilities, but have also had a chance to prove themselves on a world stage. The usual home of your proverbial Supermans and Wolverines, or anyone that had enough power, skill, or history to make themselves the best.

B: Talented and powerful superheroes/villains who aren’t quite on the level of, say, Alpha Force.

C: Enough powers or physical combat proficiency to stand a chance against the average supervillain.

D: Some combat training, or powers that could be somewhat useful if implemented correctly. Could probably take down a regular, non-super criminal.

E: No powers – or superpowers too feeble to actually help anybody fight crime except under extremely specific circumstances – plus no combat training.

F: No combat training plus a power that’s an active detriment to a character, and not because it’s just sooo powerful that they lose control of it sometimes – powers that have no function besides inconveniencing their user.