The whole thing as you have said come down to - In a scenario where a character is reborn and becomes OP, it can be justified if they had lived a harsh life in any form. In this sense, the concept of karma comes into play, where either the creation itself, a god, or a similar being with compassion repay their karma and reincarnate them into a new world.
Many of the stories or shows you mentioned have similar settings, which is why I mentioned them. I also have similar ideas in mind. However, I'm facing a dilemma regarding how overpowered (OP) the character should be. Should I make the character completely OP in terms of skills, traits, or other aspects? Please note that the idea I have in it the main character (MC) would be born as a normal being.
I was thinking of giving him all the skills that exist or could exist, and also some traits, but his OP nature would greatly diminish as he would be a simple mortal like any other being at birth. As he levels up or progresses through the ranks, he would gain the aforementioned powers, increase perception, and acquire the abilities that come with leveling up.
However, as a mortal with maximum proficiency in water magic, for example, he wouldn't be able to control the entire world's water concept because he wouldn't possess the power to harness the entire concept of water within a given region. It would be impossible.
However, once he reaches higher ranks such as divine or celestial, he may be able to do so. In my world, skill levels determined how efficiently and precisely a skill is executed. This means that an underleveled person wouldn't be able to defeat a celestial, for instance. But he will always be the best in said power level.
The MC is highly resourceful due to his background in our time, having access to the internet, multiple knowledge sources, advanced things, reading fantasy literature, and receiving education. This gives him a significant advantage in a world governed by mana. His perspective alone could make a huge difference compared to other people.
Additionally, I thought about there can be magical solutions to various problems in the world, such as image crystals. These crystals could store events, but they might be difficult for the average person to own. However, our MC can combine his knowledge from both lives to create a camera-like device containing many magical elements. This device would be a product of his ingenuity rather than a natural crystal.
Valid points, I do have some thought of them but not on that much depth or that angle tho .. thanks for the nudge ..
yeah, everyone is mostly saying stuff like that but he is not op from the perspective of power I was thinking of making him op in the sense of max out skills that make him the god of jack of all trades. but doesn't make him one shorting an eldritch after being born for just a couple of hours .. so I was asking if should I make him acquire his skills or just give them to him to a scenario as prologue as he acquires them as he did some stuff in the void or nithily or something like that ...