Valkenhayn has been the butler to the Alucard family of vampires for centuries. He possesses a sharp wit and is concerned for Rachel's well-being. Valkenhayn seems to be worried about Rachel associating with things below her class (particularly Ragna the Bloodedge, although others might apply), but he usually acts in a sophisticated and gentlemanly manner. Judging from comments frequently dropped by Rachel, he seems to have once been a vigilante himself.

He has shown a savage temper on occasion, mainly seen during battle. During Continuum Shift he lost his temper after Hazama insulted Rachel, his voice deepened and his teeth sharpened into fangs.

Valkenhayn appears to possess the ability to teleport those that he lays his hands on. He also knows a mysterious and painful technique that helped to unlock Jin Kisaragi's hidden power after his abduction by Rachel in Continuum Shift. This technique, strangely, actually inhibited Jin from using Yukianesa for a time because it was his will to use the blade. In the end, Jin realized this and truly became its master (the 'hidden power' was probably referring to this fact).

According to the BlazBlue Material Collection, he is one of the Six Heroes and an exceptionally strong fighter. Due to the fact that he fought alongside Jubei and Hakumen against the Black Beast, Valkenhayn must be well over 100 years old. In a mural in Hakumen's ending in Calamity Trigger, it showed all of the Six Heroes (in the appearance of more simple forms) and Valkenhayn is the only one who fought the beast without weapons.

Furthermore, a more recent Material Collection revealed more information on Valkenhayn's past. He is a Beastkin like Jubei, Makoto, and Kokonoe, and as such has an extremely long lifespan. He once fought against Clavis Alucard as a rival, and the two became friends. Valkenhayn's loyalty to Clavis also extends to Rachel, whom he has a soft spot for to this day. When Clavis mysteriously vanished, he swore to help his friend's daughter in any way he could.