'The Beginning After The End' is also a top - notch OP MC novel. Arthur Leywin is reincarnated into a world with magic and he has an innate talent that allows him to quickly rise in power. The story not only focuses on his power growth but also on his relationships and the world - building is quite immersive.
I'm not entirely sure as I haven't read the whole novel, but the most obvious main character would be the overpowered one in the minion role. There might also be a master or a group of characters that the minion has to interact with, like a powerful wizard or a noble who has the minion under their command.
They often have unique abilities. For example, in 'The Irregular at Magic High School', Tatsuya has a special form of magic that is far more powerful than others. This sets them apart from normal characters.
Goku would probably be the most overpowered. His ability to constantly increase his power level and his wide range of energy attacks like the Kamehameha would make him a tough opponent in Super Smash Bros. He can also fly, which gives him an advantage in the game's arenas.
Overpowered characters in light novels can also be a drawback. They might make the story less suspenseful. If a character can solve every problem effortlessly, the tension in the plot decreases. However, in some cases, like in 'Overlord', the overpowered status of the main character is used to explore different power dynamics and how he rules in a new world, adding an interesting twist to the typical story formula.
One great 'overpowered Harry' fanfiction is 'Harry Potter and the Methods of Rationality'. In this fic, Harry is highly intelligent and uses his knowledge in a very unique way, which makes him seem overpowered compared to his canonical self. He approaches magic and the wizarding world with a scientific mindset, leading to many interesting twists on the original story.
Edward Elric from 'Fullmetal Alchemist' also has a great story. He and his brother Alphonse, in an attempt to bring their mother back through alchemy, violated the taboo and lost parts of their bodies. Edward then embarked on a journey to find the Philosopher's Stone to restore their bodies. His story is full of themes like sacrifice, redemption, and the pursuit of knowledge.
They can drive the plot forward quickly. Since they are powerful, they can take on big challenges early on, like in 'No Game No Life', the siblings' overpowered intelligence allows them to enter high - stakes games right away.
It's mainly for creating exciting storylines and giving readers that wow factor. Overpowered characters can face extreme challenges and still come out on top, making for thrilling reads.