"The Rival" is a cancelled character from an unknown Castlevania game. From the original description, it's implied that contrary to the Richter's and Maria's sprites, he was not a character from the canceled Sega 32X Castlevania game known in fan circles as "Castlevania: The Bloodletting". Possibly, he was a canceled character from Castlevania: Rondo of Blood.
- The Rival at the Castlevania Fan Wiki. Fans have created a variety of characters using this sprite, some saying that he was Richter's brother Hanz or son Harker.