Such a light novel could have the MC struggling to fit in among the elves or uncovering hidden secrets of the elven world. The story might also involve a romance with another elf or a quest to protect the elven realm from some external threat.
One such light novel could be 'Reincarnated as a Magic Emperor'. In this story, the main character is reborn in a magical world with new powers and adventures.
Often in this type of light novel, the reincarnated character has friends or allies among the elves. These could be young elves who are curious about the new ideas the main character brings. And there could be an elder elf who has great wisdom and guides the main character through the intricacies of elven culture and magic. These are all potential main characters in the story.
You might want to check out 'Reincarnated as a Behemoth'. Here, the MC's reincarnation as a monster leads to an exciting and action-packed journey filled with challenges and growth.
One big thing is the character's growth and adaptation to the new world. They often have unique skills or knowledge from their past life that give them an edge.
One popular 'human reincarnated as elf light novel' is 'Re:Monster'. In this story, the protagonist is reincarnated as a goblin, which is related to the elf concept in the sense of being a fantasy race. It has an interesting plot about the protagonist's growth and his interactions in the new world.
A theme related to power and growth is prevalent. As they start their new life as an elf, they usually have to gain power to survive. This could involve leveling up, like in a game - like system in some novels, or learning ancient elven magic. They might also form alliances with other races or individuals in their pursuit of power and to protect their new elven homeland.
One such light novel is 'Re:Zero 鈭 Starting Life in Another World'. The MC Subaru gets reincarnated into a fantasy world and faces numerous challenges.
I'd recommend 'The Elf's Journey'. In this novel, the main character has a remarkable transformation and becomes an elf. The story has a rich world-building and engaging plot.
In 'Reincarnated as an Elf', perhaps the interaction between the reincarnated character and other elves is a key plot point. There could be conflicts due to the main character having different values from the traditional elven way of life. Also, the exploration of elven lands and uncovering their secrets might be really engaging.
One possible novel could be 'The Enchanted Transformation'. In it, the MC undergoes a magical transformation and becomes an elf girl, embarking on a thrilling adventure.