A tag used to point out the illustration or its author's abnormality. Mainly appended by viewers.
The tag was initially used to insult, but there is no lack of usage to denote, "This is so sick, it's cool," either. Works displaying peculiar sexual tastes also mix in with this tag.
A variation of the "Author is ＊＊ Series", "Author is ＊＊".