A best OP MC can also be defined by their relationships. In light novels like 'Re:Zero', Subaru has his Return by Death ability which is OP in a sense. But it's his relationships with the other characters, his love for Emilia, and his growth through his interactions that make him a great MC. The way an MC interacts with the world around them, whether it's a fantasy or sci - fi setting, and how they use their powers to either uphold or subvert the norms of that world also contribute to them being considered 'best' and 'OP'.
One great light novel with a powerful main character (MC) is 'Overlord'. The MC, Ainz Ooal Gown, is extremely OP (overpowered). He starts as a max - level character in a game world that has suddenly become a reality. His abilities and strategic mind make him nearly unbeatable.
Well, first of all, a strong character arc for the MC. If the MC starts from being weak and gradually becomes OP in a believable way, it's really appealing. For example, in some novels, the MC has to endure hardships and learn from his experiences to gain power.
The concept of starting anew with knowledge from a past life is always appealing. For an OP MC, it means they can often use their previous knowledge to gain an edge. For instance, if they were a gamer in their past life and are reincarnated into a game - like world, they can quickly understand the rules and power - up systems. It's like having a cheat code.
One great Chinese light novel with a powerful main character (MC) is 'Martial World'. The MC in this novel has an amazing journey of growth in the martial arts world. He overcomes numerous challenges and his character development is really interesting.
One such light novel could be 'Sword Art Online'. The main character Kirito is extremely powerful and often overcomes difficult challenges with ease.
The light novel 'Akame ga Kill!' also has an OP female MC in Akame. She is a highly trained assassin with a powerful teigu (a special weapon). Her skills in combat and stealth are top - notch, allowing her to take on much stronger opponents.
I'm not entirely sure as there could be many light novels with an OP (overpowered) main character (MC). It could be about a hero in a fantasy world who has extraordinary powers and uses them to overcome various challenges.
I think 'That Time I Got Reincarnated as a Slime' is also a top OP MC light novel. Rimuru Tempest, the slime, gains many powers and abilities as he progresses. He starts from being a weak slime but quickly becomes very powerful, with skills like 'Predator' which allows him to absorb other beings and gain their powers. It's really interesting to see how he uses his OP abilities to build his own nation.
One factor that makes it excellent is the character growth, even if the Mc is OP from the start. Maybe they start as physically strong but lack emotional intelligence, and over time they develop in that aspect. Also, an engaging plot that challenges the OP Mc in different ways is crucial. If the Mc just breezes through everything without any real struggle, it gets boring. But if there are opponents or situations that make the Mc think and adapt, it's a great light novel.
Rebuilding society can also be a theme. Even though the world is in chaos, the 'op mc' may have the ability and the will to start building something new. There is often a sense of adventure as well. The main character goes on quests, discovers new places, and uncovers secrets in the apocalyptic landscape. And there's the theme of morality. In a world where the rules have changed, the 'op mc' has to decide what is right and wrong.