I think 'Overlord' is a great one. The protagonist, Momonga, is an undead overlord in a new world, and his actions and the way he rules his territory can be seen as villainous in the eyes of some. 'Akame ga Kill!' also has some interesting villain - like characters. The organization in the anime, such as Esdeath, has cruel and power - hungry motives. Another good one is 'Kabaneri of the Iron Fortress'. The Kabane are like villains, and the story also shows how some humans can turn into something close to villains in the face of survival.
The Lair is purely fictional. It was crafted from the imagination of the creative team and doesn't draw from real-life events. They came up with the plot and characters to entertain the audience.
I'm not sure specifically as I haven't read the exact novel. But usually, in such novels, the main villains could be power - hungry individuals. They might be those who have been wronged in the past and now seek revenge in a very extreme way, making them villains in the eyes of others.
Well, in 'villians are destined to die novel', a main theme is probably moral complexity. Villains are not just one - dimensional bad guys. Their actions might be influenced by their past experiences or the circumstances they are in. And then there's the theme of mortality. Their 'destined to die' part shows that no matter how powerful or evil they seem, death is an inescapable end for them. Also, power dynamics could be a theme as they use their villainous powers and face consequences.
I'm not sure exactly as I haven't read the novel. But there's probably a protagonist who is the one becoming part of the villain's family. Then there would be the members of the villain's family, like a powerful and maybe cruel father figure in the family who is the main villain.
In 'becoming the villians family novel', power and corruption could be important themes. The villain's family might be involved in power - seeking and corrupt practices, and the main character has to navigate through this. Also, identity is likely a theme as the character is changing their own identity by becoming part of this new family.
I'm not entirely sure specifically what 'lair visual novel' is about as there could be many different ones with that name. It could potentially be about a fictional lair, perhaps a hidden place where adventures or mysteries unfold in a visual novel format.
Once upon a Halloween night, there was an old lair deep in the forest. A group of curious teenagers decided to explore it. As they entered, a cold wind blew, and the candles on the walls flickered ominously. Strange noises echoed through the corridors. Suddenly, a shadowy figure with glowing eyes emerged from the darkness. They ran in panic, but the lair seemed to have no end. One by one, they got separated. In the end, none of them were ever seen again.