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Most likely, F K'un-L'un is fictional. Usually, such names and concepts come from the realm of imagination and aren't based on actual facts or events.

To turn an anime cap to manga cap, you have to focus on simplifying the lines and colors. Manga often has cleaner and more stylized designs. Also, pay attention to the shading and texture to give it that manga look.

You need to focus on the style and details. Manga caps often have simpler lines and less shading compared to anime caps.

Among the baseball cap brands, the more famous ones were MLM (Korean fashion brand), Newera (a well-known cap brand in the United States, also the ancestor of baseball caps), Trendi, and so on. Among them, MLV's New York (New York) and Los Angeles (Los Angeles) series of baseball caps were very famous. They were featured by the same embroidered LOGO design and various styles, mainly using embroidery techniques. Newera was founded in Buffalo, New York, USA in 1920. In 1932, it launched a baseball cap. In 1950, it became an independent hat manufacturer that supplied baseball caps to the major leagues and launched the 59FIFTY classic baseball cap. As a new brand, Trendi had gained attention with its unique artistic style. Each series had different logo patterns to reflect the current hot spots, using a variety of materials, and the baseball cap was regarded as a work of art and integrated into fashion elements. The genuine baseball cap brands that could be bought in China shopping malls were mainly MLV and Newera. Watching Léon: The Assassin wasn't satisfying enough. Everyone is welcome to click to read the novel!

It's not that complicated. You need to focus on the style and details of the manga. Analyze the linework, shading, and character features.