There are many. Like a sci-fi one where the MC's unique abilities are misunderstood or undervalued until a major crisis forces everyone to recognize their potential.
Occasionally, in light novels with unconventional structures, the MC being a side character can be used to subvert expectations. Like in a story where the 'side character' actually drives the main plot forward in unexpected ways.
Eunuch novels may be underestimated in ancient literature, but the following are some recommended eunuch novels: " Palace of Mercy " Author: Fourth Sister You. The male protagonist is a sinister, cunning, and ruthless Lord Palm Print, but he has a trace of warmth for the female protagonist. The author of Ye Yu's Late Spring was a Sphinx cat. It told the story of a ruthless fake eunuch and a little princess who was cold on the outside but delicate on the inside. Married to a Dead Eunuch. Author: Scattered into Mud. It described the story between a transmigrated woman and a real eunuch. These novels all showed the role and emotional world of eunuchs in ancient society.
It was not an idiom in the strict sense. It was more like a vernacular expression, but it was a more formal and written idiom.
There are many. One example could be 'The Underdog's Journey' where the MC faces constant bullying but overcomes it through inner strength and determination.
Well, there are many. One example could be a light novel where the MC is a single parent struggling to balance raising a child and dealing with supernatural adventures.
There are many. One example could be 'Divine Ascension' where the MC gains god-like powers and uses them to protect the world.
It might be a historical light novel where the MC invents something revolutionary for that era, like a new farming tool or a method of transportation. Or it could be in a dystopian setting where the invention is a key to survival.
I'd recommend 'Reign of the Dragon'. Here, the MC is a dragon trying to protect its territory and uncover ancient secrets while dealing with various enemies.
There are quite a few. One example could be 'Obsession's Edge' where the MC's yandere tendencies drive the intense plot.
You might like 'Supreme Legacy'. Here, the main character is OP due to a special inheritance or a hidden power that emerges, making them nearly unbeatable.