Johannes
Near the beginning of Arvantville, players will run into a character named Johannes. When interacting with him, he’ll offer upgraded weapons, items, and shards in exchange for collected materials.
If that name sounds familiar, it’s probably because the main protagonist of the first arc of JoJo’s Bizzare Adventure is Joseph Joestar. Now the name itself could be a coincidence, but the fact that Johannes is voiced by Ben Diskin certainly isn’t.
Alongside voicing the English version of Sai in Naruto Shippuden and Char Aznable in Mobile Suit Gundam: The Origin, Diskin is best known for voicing Joseph Joestar in the Phantom Blood portion of JoJo’s Bizzare Adventure. This could simply be all part of the plan for ArtPlay to integrate Bloodstained: Ritual of the Night into the Jojo universe.