One reason could be self - protection. In many light novels, the world is filled with danger. If the main character reveals his full strength too early, he might attract unwanted enemies. For example, in a world full of power - hungry villains, showing off strength could make the character a target.
I don't know for sure as I haven't read it. But most likely there is the player himself who is the central character. There might also be friends or foes he interacts with who play important roles in either trying to uncover his past or helping him keep it hidden.
Another example is 'Sword Art Online'. Kirito often hides his full capabilities in the game world. He doesn't always show his best skills and strength, especially when he wants to avoid unwanted attention or when he is trying to figure out the motives of other players. He only reveals his true strength when it's absolutely necessary, like when facing powerful bosses or protecting his friends.
One popular one is 'Solo Leveling'. The main character, Sung Jin - Woo, initially appears weak but gradually reveals his incredible strength. Another is 'Overlord', where the protagonist Momonga hides his true power in the new world he is transported to. And 'The Rising of the Shield Hero' also has a main character, Naofumi Iwatani, who is underestimated at first and hides his growing capabilities.
One common device is the element of surprise. For example, in 'Solo Leveling', when Sung Jin - Woo suddenly shows his enhanced powers in a battle, it surprises both the enemies and other characters. Another is the underdog story arc. The main character is often underestimated, like Naofumi in 'The Rising of the Shield Hero', which adds to the tension and excitement when their strength is finally revealed.
"I recommend" The Bamboo Horse of Rebirth ". This is a romantic novel about pure love. The main character, Luo Xi, has Yin-Yang eyes and the ability to predict the future. She can hide her appearance. If you like this type of novel, you might as well read it. I hope you like this fairy's recommendation. Muah ~😗
Since I don't have in - depth knowledge of this light novel, it could be that the 'player' has a dark or complicated past. Maybe he was involved in some sort of scandal or had a difficult upbringing. The story might show how his past affects his current actions and relationships within the context of the light novel's world, whether it's a virtual game world or some other fictional setting.
Another theme is growth. Often, these characters are not only hiding their strength but also growing in power secretly. They might be training in isolation or learning new skills without others knowing. This internal growth is then shown externally when they unveil their true strength. In 'Solo Leveling', the main character's growth while hiding his power is a significant part of the story.
Well, 'The Legendary Moonlight Sculptor' also fits. The main character keeps his real skills and power under wraps. He has to navigate through a virtual world while concealing his true capabilities, and the story unfolds as he gradually unveils his strength in different situations.
I recommend the book 'Douluo: My Strength Was Almost Exposed' to you. The main character Jiang Chen activated the hidden strength system after he crossed over to Douluo Continent. As long as he hid his strength well, no one would be able to find out how powerful he was. From then on, there was another hidden king on Douluo Continent. I hope you like this recommendation.😘