Power progression is a common theme. The OP main character usually starts from a certain level of strength and becomes even more powerful over time. Another is the development of relationships with multiple female characters. They often start with misunderstandings or the main character helping the females in some way, and then relationships grow.
The harem aspect means there are multiple female characters who are attracted to the MC. In these manga, the relationships can range from simple admiration to deeper emotional bonds. The female characters often have diverse personalities and abilities, adding to the complexity of the story. For instance, in 'Death March to the Parallel World Rhapsody', the harem members include a princess, an elf, etc.
Sure. 'Date A Live' is a great 'op mc harem light novel'. Shido Itsuka has the ability to seal the powers of the Spirits, which are powerful female entities. He ends up in a harem - like situation as he tries to save the Spirits. Also, 'High School DxD' features Issei Hyoudou, an OP main character who is surrounded by a bevy of beautiful female devils and angels, making it a typical harem light novel.
There's also 'Death March to the Parallel World Rhapsody'. The MC Ichirou Suzuki is overpowered and gradually builds up a harem of various characters in the isekai setting. The story has a mix of adventure, comedy and some harem elements.
First, set boundaries. Don't let them cross into your personal space or control your life. For example, if they try to interfere with your career choice, firmly say no. Second, avoid getting into their emotional games. Don't respond to their attempts to manipulate you emotionally. And third, seek support from outside the family, like friends or a therapist.
I would also recommend 'We Need to Talk About Kevin' by Lionel Shriver. It tells the story from the perspective of a mother trying to understand her son, Kevin, who has committed a heinous act. It delves deep into the nature - nurture debate regarding psychopathy and is a thought - provoking read.
Patrick Bateman from 'American Psycho' is a prime example of a fictional psychopath. He leads a double life and exhibits extreme violence and sociopathic tendencies.
There's no prominent love story in it. The plot mainly centers around the protagonist's experiences and the mystery surrounding their actions and thoughts.