All 3D galleries go to "Misc" category regardless of other factors.
Oh, and as a precaution: engine / instrument used in creation of the gallery - id est: "Photoshop", "Maya", "Koikatsu", or "Skyrim" - should NEVER be used in tagging regardless of anything else.
Ignore Pseudo-Nim's outdated comment. The rules have changed since then, at least for Koikatsu. The "Parody:Koikatsu" tag can now be used for galleries made in Koikatsu https://ehwiki.org/wiki/koikatsu "Type: Video Game Japanese: コイカツ Note: The tag is also acceptable on galleries made with the software, even if no parodied characters from the game are present. This is allowed for koikatsu only on an exceptional basis."