Nazrin / Nyn - CHEEEEEESE!

For those who wish to dig deeper in the rabbit hole, she's NYN姉貴 (sister nyon) from Cookie series, an off shoot of touhou which doesn't really have any connections other than the borrowed character resemblance. There are like a dozen of characters borrowed Marisa's likeliness for example. The majority of memes from nico douga with cookie has nothing to do with touhou.