I have all of my characters start from the bottom, unless there’s a good reason they already have power and there’s usually some kind of trade off for their powers. They’re not good with them right away. I make sure they struggle and learn to use it as their character development goes on.
What you saw in the Characters Cafe were my characters pretty much at the end or near the end of their development.
For example, Xander’s Mushin. A unique skill in my series where there are only a few side/support characters that have it, but Xander consistently remains as the only human character with it. The drawback of Mushin is the huge strain on the body and for him, it remains incomplete across several novels. Because he just can’t figure it out. It’s not widely known, but slowly and surely, it will eventually become a known thing that anybody can get but it would be extremely difficult in-universe.
Another example would be Ren’s Regalia. When he first shows up in-universe, his manipulation of aura is wild and unrefined. He knows how to use it to an extent and it tired him out, but better control over it doesn’t get seen until after a time skip at some point, insisting that he learned.
Not all of my protagonist-tier characters are equal in power, but they can each defeat each other in their own ways through their wit. Each one of them serves a different purpose, some more than others. When it comes to a power scale in my series, it’s clearly there, but I don’t run things by numbers or feats. I prefer to let characters grow in power overtime. There’s no fun if a character is overpowered right off the bat unless it’s satire/parody like One Punch Man or there’s some kind of inner struggle. There’ll always be a side character that’s stronger than my main cast of characters though.