Shingetsutan Tsukihime, Kara no Kyoukai 7: Satsujin Kousatsu (Kou) Recommendations
the main protagonists in both share the same name and the ability to see lines which once cut the whole object crumbles. they both have this dark feel to them and involve a series of murders. if you haven't watch neither i suggest you watch kara no kyoukai first as it is a vastly superior story with better developed characters, drama, and romance.
The character types and sequel is almost similar. It contains the same power as the protagonists of Kara no Kyoukai and Shingetsutan Tsukihime