Rudolph Van Richton

Background
While not much is known as to how Rudolph ended up in Ravenloft or how he became a vampire hunter, it is known he eventually met up with Esmerelda, and for a time, they were hunters together, until their friendship fell apart, not beyond repair, but enough that they decided to mutually go their separate ways. Rudolph had reportedly been looking to kill Lord Strahd for many years.

Interactions With Mystic Obscura
Rudolph returned to his inn, where he found Mystic Obscura, along with Esmeralda awaiting him. After learning what they knew, he agreed to help them. Together they set off to find the Sun Blade, which they did, before heading off to find Strahd.

Finding him within the chapel, the group confronted Strahd. Rudolph however was attacked by their guide, Caidove, revealing herself to be a traitor and a vampire. Rudolph died shortly after.

It was revealed, after his death, that Esmeralda was in fact Rudolph's daughter, the two having not seen each other for years.