Definitely not. Lookism is a work of fiction. The plot and scenarios were crafted by the creator to tell an interesting and captivating story, not drawn from real events or people.
In the absence of knowledge about the 'Big Mouth Vader Johan' story, Big Mouth could be a descriptive name for a character who is overly chatty or has a unique oral feature. Vader might be related to the idea of a strong, authoritative figure, similar to the Star Wars character Darth Vader. Johan might be a common name for the protagonist in this story. It's possible that these three elements - the talkative Big Mouth, the powerful Vader - like figure, and Johan - interact in various ways within the plot of the story, but without the story itself, it's hard to be certain.
It's a type of visual novel that likely focuses on a character named Yoosung. Usually, it involves a story with various plotlines such as relationships, personal growth, and perhaps some sort of adventure or mystery. However, without more specific information, it's hard to say exactly what it's about.
Well, generally, yoosung lemon fanfic often focuses on the character Yoosung in a romantic and sometimes more adult - themed context. The 'lemon' part usually implies some form of sexual or romantic intimacy. These fanfics might have a strong focus on Yoosung's personality traits, like his shyness or his passionate side. They also tend to be set in the world of the original work that Yoosung is from, so the settings and other characters might play important roles in the story as well.
Irregular manhwa lookism often features unique art styles and unconventional character designs. It might also have unexpected plot twists and a focus on social issues.