INTERESTING QUESTION, WELL LET ME THINK HELLSNG SERIE & OVA, SAINT SEIYA OR KNIGHT OF ZODIAC, DEMON BANE, TRIGUN, Sprigan, Wicked City, Demon city Shinjuku, Demon Lod Dante and too many all the anime series, i´ml ike it, all are my favorites because i learn from all always XD n.n ^^.