One similar light novel could be 'Overlord'. It also features a powerful protagonist in a fantasy world. Another is 'Sword Art Online', which has elements of adventure and a strong lead character. And 'Log Horizon' is also a great choice as it shares the theme of being in a different world with unique abilities.
I'm not entirely sure as I haven't read it in detail. But generally, manhwa novels often revolve around characters' growth, their dreams, and the challenges they face. It might be about a character striving to be the best in a particular field related to a mound, perhaps in a sports context like baseball where the mound is important.
A fictionalized memoir is a blend of real-life experiences and fictional elements. It's not strictly factual like a traditional memoir. The author might tweak events or add fictional characters for a more engaging story.
Night is actually a memoir. The author recounts real events and feelings from a specific period of their life, which is a key characteristic of a memoir.