First of all I'm going to get this out of the way, most of the people that are complaining about this show have never played the games. They're literally contradicting themselves when they say they like the first Castlevania series, but don't criticize any of the character race swapping in that series or say they are not sticking to the source material from the games... But without googling it can't tell you exactly what Castlevania series Isaac and Hector appear in. As a fan of the Castlevania series and a person who has played mostly all of the games and has a fair understanding of the history of Castlevania. I love this show and if you like a show that has good animation no scratch that great animation action and character development this is a show for you.