I guess the four most famous, popular and well-known Gu Long hero (in reality) would have to be:
- "Thievf General" Chu Liuxiang
- "Four Eyebrows" Lu Xiaofeng
- Ximen Chuixue aka Simon the Snow Blower
- "Little Li's Flying Dagger" Li Xunhuan
Among them (or others), who do you think is the most famous GL hero in reality? Famous as in most people had heard of the hero's name before, including people who doesn't or have little interaction with wuxia stuffs.
I would guess its CLX. (although LXH's nickname of "Little Li's Flying Dagger" is quite well-known too..)