For tagging purposes, is this an original character or a Korean version exclusive? "한국총기로 나올 예정인 K5 팬아트입니다." seems to be referring to the pistol coming out in the game, though.

I believe this was a new T-doll announced to be released earlier on Korean servers than other servers, but someone can read and confirm the info:

• Official Announcement Tweet (art by lpip)
• Namuwiki

Much appreciated, Mikaeri! Hype for lpip art

Hype VoHiYo

I really hope they bring GF to JP (and eventually Americas) soon though, I feel like it has just as much a chance at huge popularity as the other copyright titans on this site (Kancolle, FGO, Idolmaster, GBF, garupan). Official art and character design is quite top notch IMO (which is why I've been uploading so much lately).