In order to have a better understanding of the power level, I made a table for each character's stats. They'll have some importance, as a handful of classes/people within the story can (or will be able to) access them.

  I've put Laura in it to represent a normal person strength from within the world, and Valentine because she's one of the few to have reached the end. Don't mind Eve...

  Here's the meaning of each stats:

  -Strength: The ability to lift heavy things and hit hard.

  -Agility: The ability to run fast and evade quickly.

  -Dexterity: The ability to craft and/or use weapons.

  -Intelligence: The ability to remember things and solve puzzles quickly.

  -Flux Control: The ability to use flux efficiently. (Using more flux than you're supposed to will result in heavy headaches and loss of consciousness)

  -Flux Power: The pool of flux available to you at a time. The higher it is, the more powerful spells and techniques you can use. (Like a mana pool)

  Techniques are their ability, but for some, they simply have too much of them, so I only put the most relevant ones.

  The lvl don't have any impact on the stats, they're indicative of the corresponding struggle in term of strength. If you come to a struggle under level, there is a high chance you'll die horribly, and there is a huge step after each tens (10,20,30,...) That's why a few are stuck on lvl19, even though they're not that far behind.

  There is also a lot of hidden stats, such as Willpower, Toughness, Wisdom, etc. And Techniques are playing a huge role in one's ability to kick asses. For instance, Samsy has shitty stats compared to others, but he can see into the future so he's not as far behind as it seems.

  For reference, most newcomers start with all their stats below 10.

  Finally, this is their stats when they leave stage 10, so it is bound to change.

  Yes, there are overpowered, but it's only the start of the adventure, and even though their stats are sometimes tenfold what it is in a common session, they were close to dying a fair amount of times. And they're not even halfway through.