Typically, necromancer light novels often have a dark and mysterious atmosphere. The necromancer characters usually possess the ability to raise and control the undead. This creates a spooky and often macabre setting. For example, in 'Overlord', the necromancer - like main character's control over the undead gives the story a sense of power and dread.
Typically, they involve a system, like a game - like or magic - based system that governs the necromancer's abilities. For example, in some novels, the necromancer has to level up their skills of raising the dead within the system.
One popular necromancer light novel is 'Overlord'. In this novel, the main character has necromancer - like abilities as he commands a vast army of undead. Another is 'Grimgar of Fantasy and Ash' which also features elements related to necromancy within its fantasy world. And 'Re:Zero − Starting Life in Another World' has some arcs where necromancy - related concepts are explored.
Shiroe from 'Log Horizon' has knowledge of the necromantic spells in the game world of the light novel. He is one of the more intelligent characters who can understand and potentially use such magic. In 'Death March to the Parallel World Rhapsody', the protagonist also has run - ins with necromancers and their undead creations, making those necromancers somewhat notable characters within the context of the story.
Power and its consequences. Necromancers often gain great power by controlling the undead, but this comes with a price. They are usually shunned by society, so there's a theme of isolation.
Isolation. Many necromancer girl characters are isolated because their powers are seen as dark or evil. People around them may fear or shun them, which is a common theme in these light novels.
Power and its abuse. Often, the overpowered necromancer has to deal with the temptation of using their vast power for selfish reasons. For example, they might be able to raise entire armies of the undead but have to decide if they should use that power for conquest or for more noble causes.
One popular system necromancer light novel is 'Overlord'. In this novel, the main character has necromancer - like abilities within a game - turned - reality system. It's full of interesting world - building and character development.
A 'disastrous necromancer' in light novels can also be the result of a curse or some ancient magic gone wrong. Maybe they were an ordinary mage who dabbled in necromancy without fully understanding it. And then something unexpected happened, like they became linked to a powerful and malevolent force that forces them to raise the dead against their will. This uncontrollable aspect makes them 'disastrous' as they are constantly causing trouble, whether they want to or not. Their story then becomes about trying to break free from this curse or control while also dealing with the chaos their undead creations are causing.
One popular necromancer light novel is 'Overlord'. In this story, the main character has necromancer - like abilities and controls a vast army of undead. Another great one is 'Death March to the Parallel World Rhapsody' where the protagonist also dabbles in necromancy - related magic. And 'The Rising of the Shield Hero' has elements of necromancy as well, with the main character being able to summon undead creatures to fight for him.