Sword Art Online. Kirito is a very skilled player in a virtual reality game world. The first arc of the story is about him trying to clear the game and survive. It has a cool concept, with elements of action, adventure, and a bit of romance. However, it also has some controversial parts in later arcs but overall is a popular anime with a strong main character.
Fullmetal Alchemist: Brotherhood. Edward Elric is a very capable alchemist. The story is about the brothers' journey to find the Philosopher's Stone to restore their bodies. It has a great blend of action, mystery, and moral lessons, with a well - crafted world and engaging characters.
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.
One Piece. The main character Luffy is extremely powerful and has a great goal. The story is about his journey to find the One Piece and become the Pirate King. It has a vast world, diverse characters, and many epic battles.
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.
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.
I'd recommend 'The Breaker' - it has a powerful main character and a sweet romance storyline.
A very popular one is 'One Piece'. Luffy is the OP MC. While the love story aspect isn't as central as in some other anime, his relationship with Boa Hancock has elements of a love story. Hancock is in love with Luffy and it adds an interesting dynamic to the story, especially considering Luffy's rather oblivious nature to her feelings.
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 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 great OP MC Manhwa is 'The God of High School'. It has an incredibly powerful main character and an exciting plot.
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.