Here is Hiro, a character from Fangsama.

The original character from sama's modelsheet had a nocturnal and """satanic""" look, dressed in cool leather clothes, and "tatooed" with tribal markings. Since fangsama likes this "profane" thematic I decided to draw some real simbols on him.
I was researching on the net about them and found out that each one is can be considered either sacred and satanic! For exemple, the inverted cross ( St. Peter's cross) is usually said to be an anti-christ sign, but the Vatican uses it since the begin of its story as an average christian symbol. The same goes for the "Fish" symbol, usually aimed as a average christian symbol, is also considered satanic for others!!!!

Well, make your own choice afterall XD

(interesting is the fact I found a big data about the symbols in sites of Radical Christian churches!!!)