The character for Hong literally means "Scarlet" in Japanese and "Red" in Chinese, and Meiling means "Beautiful Bell". The latter part of her name, Meiling, is at least a common Chinese name. These characters can be read in Japanese as "Kurenai Misuzu", and you'll sometimes see her name mispronounced or miswritten that way.
Despite reaching some level of recognition by becoming a playable character in Immaterial and Missing Power (albeit through a downloaded patch), Meiling was the only character not to have a storyline. She is almost universally considered a bottom tier character in the game as well, despite the fact that she has some of the most impressive combos in the game, as shown in here.
Many of her lines in Unthinkable Natural Law indicate that Meiling has boastful pride in China. She says "You're all not there yet! You're all children compared to 4000 years of history!", compares Yuyuko to a jiangshi (Chinese vampire), and notes that Tenshi and the celestials read Chinese works. (Many of Tenshi's win quotes in SWR come from Chinese classics.) This is how Chinese characters in Japanese shows and related media are almost always depicted: stereotypically prideful.
The script also reveals that she and Remilia read manga created by the tengu.
Meiling's win quote against Sakuya in Unthinkable Natural Law does not imply that Sakuya abuses her, but rather builds a formal, friendly setting between the two. Meiling telling Sakuya that she always goes easy on her could hint that the two sometimes have friendly battles. If it were a formal match, she would (and could) very easily take the Chief Maid down. As Sakuya greatly cares for Meiling in canon (as well as advises her on the importance of not slacking off), this can be taken to some credibility.
Meiling and Remilia's win quotes against each other in Unthinkable Natural Law regarding manga that Remilia let Meiling borrow suggests that their relationship is very friendly, and that they are just fighting for the fun of it.
If Meiling loses to Youmu in Unthinkable Natural Law, the latter will ask if Meiling shouldn't just use a weapon, namely a green dragon blade. This can be a source of confusion, since many would imagine the legendary Green Dragon Crescent Blade wielded by the famous Chinese general Guan Yu, but women seldom use pole arms in Chinese martial arts. In Japan, the term has become a common misnomer for the liuyedao and other Chinese sabers. As Youmu admits she has only heard about them in stories, the use of her local, incorrect term is likely intentional.
Meiling and Koakuma are the only characters (that live in the Scarlet Devil Mansion) who do not appear in the popular video Bad Apple!.
Meiling's moveset in Unthinkable Natural Law closely resembles that of Yun's moveset from the "Street fighter" series as shown in this video. Yun is also Chinese like Meiling.
Meiling is one of the few characters who does not appear as a background character in Hopeless Masquerade.
In China, when people wear a green hat it means they have gotten out a relationship. Meiling is Chinese and she wears a green hat so it is possible that she has gotten out of a relationship, traveled the world and found herself in the hands of Remilia. Another theory is that the green hat is just something Remilia made Meiling wear against her own will.