The "Chinese Girl", better known by her nickname "China" (中国, Chuugoku), which originated on 2ch during a debate about the proper reading of her name's kanji (some believed it to be the Japanese reading "Kurenai Misuzu", and it wasn't until later that ZUN revealed that the Chinese reading "Hong Meiling" is correct). Fans came to an agreement that her defining characteristic is being Chinese, and thus called her China. Stage 3 mid-boss and boss of Touhou's The Embodiment of Scarlet Devil and later a recurring playable character.
A humanoid youkai (presumably resembling a Han Chinese) with blue or aqua eyes and long red hair with twin side braids. She works as the gatekeeper of the Scarlet Devil Mansion and specializes in Chinese martial arts. Unusually for a Touhou character, it is unclear what kind of youkai Meiling is, but many fans associate her with dragons. This is in part due to the star on her beret, which bears the Chinese character for "dragon" (龍, Long). Hong is also the name of a specific dragon from Chinese mythology, implying Meiling has some relation (popular assumption is father-daughter), or actually is Hong, leading to frequent depictions as a dragon girl. There are also occasional images that depict her as a panda.
Fandom also often depicts Meiling as being lazy and ineffective at her job, and often being berated and/or punished for this by Izayoi Sakuya. In canon, however, her relationship with Sakuya is actually something closer to amicable co-workers, if not outright friendship, and she is generally very good at her job of repelling intruders, with the notable exception of Kirisame Marisa, who everyone else at the mansion admits is impossible to keep out when she wants access to Voile.
Nobody here but us chickens!