Who is mc in the 'mc uses liquid x to keep monsters away' light novel?

Well, without having read the specific light novel, it could be a number of things. It might be a magical potion that has properties which repel monsters. Maybe it's a special alchemical concoction that emits a scent or energy that monsters dislike.

It's difficult to determine its popularity. Just because we haven't seen it widely promoted doesn't mean it isn't popular among a certain group. It could be that it has a small but dedicated fan base that really enjoys the unique concept of the mc being forced to drink 'liquid x'. Maybe it's new and just starting to gain traction, or it could be an older title that has been overshadowed by more mainstream light novels.

I'm not sure specifically as I haven't read this particular light novel. But generally, if a main character (mc) is forced to drink 'liquid x', it could be part of some sort of experiment, a punishment, or a plot device in a strange or magical world where this liquid has special properties or consequences.

Another aspect is prior knowledge or experience. In some light novels, the MC is reincarnated or transferred from another world. Like in 'Konosuba', Kazuma has knowledge from his previous life which he uses to his advantage in the new world, and this knowledge combined with his unique skills makes him overpowered in certain 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.

There may be some novels out there that fit the general idea of a 'thrown away mc novel' that are popular, but without a more defined genre or more details it's difficult to name any. For example, some dystopian novels might have a main character who is cast aside by the ruling power or society, but they might not be directly called 'thrown away mc novel'.

Well, without more context, it's hard to say precisely. 'Thrown away mc novel' could potentially be a story where the main character has been rejected by society, family, or friends in the fictional world of the novel. Maybe the MC has some special abilities or qualities that others don't understand, leading to their being 'thrown away'.

I'm not sure exactly who the main characters are in Monster Mc Light Novel without reading it myself. But typically in a light novel, there would be a protagonist who drives the story forward. This could be a young adventurer or someone with a special power related to the'monster' aspect of the story.

In a 'Rebirth of MC Light Novel', the main character is, as the title implies, the one who is reborn. This character could be male or female, young or old. There may be other important characters like a mentor figure who guides the reborn MC in their new life. There could also be rivals who compete with the MC, either for power, love, or some other goal. And don't forget about the side characters that add depth to the story's world, such as merchants, peasants, or other adventurers.

Since we don't have much information, the main character is surely the shapeshifter MC. There may be a sidekick or a mentor figure who helps the MC along their journey, but without reading the novel, it's hard to say for sure.