He is a bit too nice to be Beckett, but he goes in that direction. I somehow can't see Halsin breaking into a nightclub to steal a book that belongs to infamous Sascha Vykos (one of my favorite npcs in the WoD btw) or trying to trick Dracula and survive to tell about it. But yeah, Halsin is certainly the guy that knows a lot and can turn into an animal.
I don't know, Halsin broke into a goblin camp with drums on every corner to track down a Nightsong... and it looks like we are heading either to the Shadowlands, Barovia or the Outer City Cemetery to face against a vampire lord with Bela Lugosi vibes. He even supervises the written History of the Grove (like Beckett) and seems to have a tragic love story in his past (like Beckett), to the point that one of his apprentices is writing fanfictions about it.
