One great OP MC (Overpowered Main Character) fantasy light novel is 'Sword Art Online'. The main character, Kirito, is extremely skilled and powerful in the virtual world of Aincrad. Another is 'Overlord'. Momonga, the main character, is a very powerful magic caster in a game world that has become a reality. Also, 'That Time I Got Reincarnated as a Slime' is good. Rimuru starts as a slime but quickly gains incredible powers and builds his own nation.
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 great anime is 'Sword Art Online'. The main character, Kirito, is extremely overpowered (OP). He is highly skilled in the virtual reality world of SAO. In the series, he also has a love story with Asuna. Their relationship develops as they face various challenges together in the dangerous game world.
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.
One great OP MC web novel is 'Solo Leveling'. The main character starts off as a weak hunter but gradually becomes extremely powerful. His growth and the unique monster - hunting system in the story are really captivating.
One good anime is 'Sword Art Online'. The main character, Kirito, is extremely overpowered. He's highly skilled in combat within the virtual world of SAO. And there's a love story between him and Asuna. Their relationship develops as they face various challenges in the game world.
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 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.