My 2nd favorite boss is right near the finale of the game. This demon would have been impossible to have seen in the NES Castelvania games.
Despite the faux 8-Bit look and feel of the game, Bathin is a quick and powerful boss.
You have to be quick and agile against his might and magic. He reminds me a lot of a boss from the Metroidvania games.
Though maybe not so much, as I beat him on the first try. Still a fun boss fight in my opinion.