 If you liked
Ao no Exorcist
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 ...then you might like
Vanitas no Karte Part 2
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The iconic blue color of the main character, main character has close companion which is his brother instead of his friend, surrounded by interesting people exploring the world of demons and powers (instead of vampires). MC has a unique background/history as well; and the villain is probably the same as well (satan instead of charlatan). The vibe of this show is very similar to vanitas no carte as I immediately sensed whilst watching it. Give it a go this is one of the most similar anime to Vanitas no Carte out there.