Makemelong

The game
Victor is throwing a get together with Rikuo, Talbain, Felicia and Harry only Morrigan and Demitri crash the party before it starts. Unnoticed by Morrigan and Demitri, Klaus the Von Gerdeheim's servant, proves to be an integral part of Harry's team.

List of cameos...
The characters from Darkstalkers have had many cameo roles in Capcom's library of games. The first being in Ken Masters' Street Fighter Alpha 2 stage and more recently the cross over, Ultimate Marvel vs. Capcom 3.