 If you liked Bleach |  ...then you might like Tokyo Ghoul |
Bleach and Tokyo Ghoul share similar concepts as well as visual representations in the narrative, they are both known as being of the highest class shonen series, the world and the characters imagery is influenced by gothic thematics, there is deep worldbuilding, with a lot of variety of characters and storylines, the drama blends greatly into the plot and the escalation of events, there are many amazing fights and uplifting moments, as well as really good musicals that accompany the whole storyline, they are overall magnificient gothic inspired narratives of the highest class.
One simple encounter with a girl changes the life of the protagonist permanently. In both series, the main character is turned into another being and has to adapt to a new life as a half-human. Both manga also feature a lot of action that the main character ends up into due to his change.