The bulk update request #12148 is pending approval.
create alias v12 (0) -> v12_(disambiguation) (0)
change category v12_(disambiguation) (0) -> invalid
create alias v12_(artist) (0) -> dibujosv12 (421)
Reason: Previously on: https://e621.net/forum_topics/59364
Conclusion: "dibujosv12" seems to have known for more for historic reasons, while "v12" has low identification though being used widely by the artist. "v12" has low identification and need to put into invalid category.
I still put this in BUR in case I need to edit it again.
Updated