Survival in a new and dangerous world is also a theme. The mc, being overpowered, has to use their power to survive and thrive. In 'Log Horizon', the players are stuck in a game world and the main characters, with their unique abilities, strive to not only survive but also make the best of the situation.
Another one is 'The Beginning After The End'. The mc has memories from his past life and uses his knowledge and unique abilities to become extremely powerful in a new world.
I'm not sure specifically as there could be many 'evil mc' (evil main character) light novels out there. It might be about a protagonist with a dark or villainous nature and their adventures, conflicts, and growth in a fictional world.
One characteristic is the powerful magic abilities of the main character. For example, in 'A Certain Magical Index', the main character has unique psychic powers which can be considered as a form of magic. These abilities often lead to exciting battles and problem - solving situations.
A mentor figure could be the one betraying the mc. The mc trusted this mentor completely, but the mentor has some hidden motives. Maybe they are working for a greater evil and see the mc as a threat or a tool to be used, so they betray the mc, which then causes the mc to turn dark.
Since we don't have more details about the light novel, we can only assume general things about the mc. The mc might be a person with a special ability or background that allows them to obtain and utilize liquid x. It could be that they have a unique heritage that gives them access to this monster - repelling liquid. Or perhaps they stumbled upon it during their travels and figured out its use through trial and error. The mc is the key player in this story who uses liquid x to fend off the monsters and drive the plot forward.
I'm not sure who the absolute best is, but some authors might be those who are good at creating complex characters. Maybe an author named Lina who has a knack for writing cold mcs with hidden depths.
I'm not sure specifically as I haven't read it. But generally, it might be about a main character (mc) who undergoes a 1000 - year training. This could involve developing superpowers, learning magic, or achieving some high level of martial arts skills.