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.
One good light novel similar to 'Op Mc' could be 'Sword Art Online'. It has a very powerful main character who is highly skilled in the virtual world. The story is filled with exciting battles and interesting relationships.
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.
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.
One popular 'good in another world op mc' light novel is 'Overlord'. In this story, the main character Momonga is extremely overpowered as he gets trapped in a game world. He has to navigate this new world with his vast powers and the loyalty of his subordinates. The plot is filled with political intrigue, battles, and exploration of the game - like world's mechanics.
Well, they are often highly intelligent. For example, in 'No Game No Life', Sora and Shiro can analyze complex game situations and come up with strategies that others can't even fathom. Another characteristic is adaptability. In 'Overlord', Momonga has to adapt to a world that is suddenly real and deal with all the new challenges while using his op powers.
They usually have a strong sense of justice or a unique goal. Take Luffy from 'One Piece' (which also has light novel adaptations). His goal of becoming the Pirate King drives him forward, and his rubber powers along with his unwavering will make him overpowered in his own way. He stands up against strong enemies to protect his friends and achieve his dream.
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.
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'.