Kid Dracula/Akumajō Special: Boku Dracula-kun is a very fun little game where you take control of a young Kid Dracula (as the name implies) and take on Galamoth the demon. Kid Dracula uses his Dracula's (his father) cape as a weapon on his adventure. Kid Dracula is the self proclaimed Demon King, or was until Galamoth challenged him for the title. After defeating Galamoth, his title is restored and all the monsters in Transylvania want to be his friend. Despite all the monsters and demons, the game is obviously pretty cute.
It's intended to be a parody of the Castlevania series, though depending on who you ask, is part of the series. Kid Dracula being a young Alucard prior to growing up and becoming a more serious character. I prefer to take it on it's own though. It's hard not to enjoy the cute monsters and the fun platforming action. The game is available on most platforms now, but was originally a Famicom/NES game. Later the Gameboy version was released which is supposed to be both a remake and a follow up at the same time. I'm not sure how that works, but I am much better at the Gameboy version for some reason.