Abel Nightroad, also known as Crusnik 02, is the main protagonist in Trinity Blood. Nightroad, born Abel Knightlord, is a member of the AX division of the Vatican Ministry of Holy Affairs. As an agent of the AX, he is referred to by his codename, "Crusnik." Originally he hated humans because of their role in the Crusniks' creation and experimentation, but ultimately changed his mind after the death of Lilith Sahl.
Abel appears as a clumsy, silly man, completely unfit for his job. He is capable of becoming very serious, especially when confronted with treacherous situations. He also frequently fakes a smile or brushes off comments that he does not want to answer.
The more that Abel activates his Krusnik nanomachines, the more he seems to drift away from himself, evident in the Krusnik nanomachines talking through him (using first person plural). In the anime he generally appears to have more control than the manga, although he is very detached from his surroundings at 80% capacity. His Krusnik form also portrays an alarming thirst for Methuselah blood and destruction. It is also mentioned that when in Krusnik form at 80% Abel has enough power to completely destroy Rome. Despite the implications of his powers, Abel goes to great lengths to hide this ability from other people, referring to it as "a mark of [his] sins."
He has many quirks throughout the series, such as putting thirteen sugars lumps in his tea, and never has more than a few dollars in his wallet at a time.