Since I don't know much about 'opmc web novel', it's difficult to determine its popularity. There could be a small but dedicated fan base for it within a specific community or genre - loving group, but without research or more knowledge, we can't really say it's popular in the general sense.
I'm not entirely sure specifically what 'opmc web novel' is as there could be many web novels with that name or it could be a relatively unknown or niche one. It might be a web novel with a unique story, characters, and plot. Maybe it's a story about adventure, love, or some sort of fantasy world.
Yes, there might be. Some web novels with demon themes have gained popularity. For instance, those that combine demon elements with other popular tropes like romance or adventure tend to attract a wide readership.
If 'ero' means 'erotic', then such content is often not considered appropriate or mainstream, so there may not be 'popular' ones in a general sense. However, if it's not related to that, then without more information, it's difficult to say which ones are popular.
As far as I know, there doesn't seem to be a widely known 'mls web novel' in the mainstream. However, it's possible that in certain online communities dedicated to soccer or web novels, there are some hidden gems that are considered popular. Maybe there are some self - published works that are getting good reviews among a small but passionate readership.
There may be some web novels out there that involve illusions and are popular, but without more context on what exactly 'illusion web novel' refers to, it's difficult to name any. There are many web novels in the fantasy and science - fiction genres that might touch on the concept of illusion as part of their storylines, but not one that is directly called 'illusion web novel' that I know of.
I'm not sure which specific 'hell mode web novel' is popular. There are so many web novels out there, and popularity can vary depending on different regions and reader groups.
I don't have specific information about popular works in 'iras web novel'. It could have some that are popular within its own niche or among a particular group of readers.
Yes, there are some popular slime web novel series. For example, 'That Time I Got Reincarnated as a Slime' is quite well - known. It follows the story of a man who is reincarnated as a slime in a fantasy world and has to navigate his new life as this strange creature, building his own kingdom and making allies along the way.
I don't know for sure, but it could have genres like fantasy. Fantasy is very popular in web novels generally, with magic and mythical creatures.
I'm not aware of any off - hand. There are so many web novels out there that it's hard to keep track of all the specific sub - genres like this one.