Obviously, the husband is one of the main characters as the title is centered around him. There must also be the person who is responsible for 'leveling him up', perhaps the wife or a close friend.
One key theme could be personal growth. As the title implies, 'leveling up' the husband might involve his development in various aspects like character, skills or status. Another theme could be relationship evolution. The process of 'leveling up' is likely to have a significant impact on the relationship between the husband and the other characters in the novel, perhaps leading to a stronger bond or a new dynamic.
It could be a romantic comedy genre. The idea of 'leveling' a husband has a touch of humor to it, and if there are relationship elements involved between the husband and wife, it may fall into this category.
I'm not sure specifically as I haven't read it in detail. But generally, it might be about a woman's journey to enhance or improve her husband in every possible way, perhaps in terms of his skills, personality, or social status.
I don't know for sure since I haven't read the novel, but I assume the main characters would be the wife who is on the mission of levelling up her husband and the husband himself.
Since I don't know the exact plot of 'leveling my husband to the max novel', it could be that the story is about a woman who has a plan to transform her husband into the best version of himself. This might involve various challenges and comical situations as she tries different methods to 'level him up', perhaps in his career, relationships or personal growth.
However, if you enjoy a more in - depth exploration of the story's lore and characters through detailed descriptions, the light novel might be for you. The light novel can offer a more comprehensive view of the world and the protagonist's inner thoughts. For instance, it might explain the complex magic system in greater detail than the manga. So, neither is objectively better; it's all about what you as a reader prefer.
Monster-fighting novels usually described the protagonist in a dangerous and challenging adventure world. Through constant fighting and improving his strength, he gradually grew into a powerful warrior or assassin.
In novels, the protagonist would usually go through a series of missions and challenges, in which he would encounter various monsters and enemies. These monsters were usually constantly upgrading and evolving to have greater strength and abilities. The protagonist needed to constantly fight and overcome these challenges in order to finally defeat powerful enemies and obtain higher levels and abilities.
In novels, the main character would often make friends with other characters and take risks with them. These characters usually had their own unique abilities and stories. They would fight and level up with the protagonist to face the various challenges of the world together.
Fictions about fighting monsters and leveling up tended to have positive and uplifting topics that encouraged readers to realize their dreams and goals through continuous efforts and struggles, to become a powerful character, and to show their strength and value in the adventure world.
You might consider giving him some space to explore the manga on his own and then discussing it together. Sharing your enthusiasm and showing how it brings you joy could potentially get him on your side.