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.
One characteristic is their unique abilities. For example, in 'Overlord', the MC has abilities that are far beyond normal characters in the game - turned - real - world setting. Another is their rapid growth or high starting level. In 'Sword Art Online', Kirito starts with a good level of skills which he further hones.
Typically, they are often very powerful from the get - go. For example, in 'Overlord', the main character has a vast array of powerful spells and an army at his disposal right after being transported to the new world. This immediate power gives them an edge in the new and often dangerous isekai settings.
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.
Often, an OP female MC has extraordinary combat skills. For example, like Saber in 'Fate/Zero' and its related works. She can wield her sword with great proficiency and take on multiple foes at once.
Typically, an OP MC in fantasy light novels has extraordinary powers or skills. For example, they might be a master of magic like in 'Overlord', where Momonga has a vast array of powerful spells. They also often have a high level of intelligence, which helps them strategize and outwit their opponents. In 'Sword Art Online', Kirito uses his knowledge of the game mechanics to his advantage. Another characteristic is quick adaptation. In 'That Time I Got Reincarnated as a Slime', Rimuru adapts to his new form and surroundings very fast and uses it to gain power.
They usually have a growth arc, even if they start out OP. Take some of the MCs in light novels like 'Log Horizon'. Shiroe, while already having strong gaming knowledge and skills, still grows in terms of his leadership and understanding of the new world he is in. This growth makes them more relatable and interesting, despite their overpowered nature.
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 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.
The genre also often features elements of self - discovery for the MC. Despite being overpowered, they still need to figure out their place in this new world. They may face moral dilemmas, form relationships, and learn about the history and secrets of the isekai world. This combination of OP abilities and personal growth in a new and strange setting is what makes the 'op mc isekai light novel' genre so appealing to many readers.