I thought this would make an interesting topic to discuss. I've noticed there's a bit of a difference between the Maria from the original Rondo of Blood and one in the remake known as The Dracula X Chronicles.
For starters lets discuss the fact that the Maria in DXC was potrayed as more of a full-fledged heroine, where as in RoB she was more of a comical joke character. Take for example the two different introductions to the character. In Dracula X Chronicles Richter rescues Maria and shows concern for her safety by telling her to go home, but we learn her parents are dead which leads to sympathy for the character. Then when she demonstrates her powers by summoning a dragon Richter realizes she's a lot stronger and braver then she looks and allows her to join him on his quest to rescue Annette and defeat Dracula However in Rondo of Blood Richter rescues young Maria who introduces herself as a vampire hunter like himself and offers to join him, and Richter laughs at her like she's batshit insane. There's never any demonstration of her powers or real sympathy for her, she's just shown as appearing silly.
I think Maria was re-created in The Dracula X Chronicles to be a more serious character. Even the way Ayami Kojima draws her she looks more like a real heroine than a funny little kid in a pink dress. Like on the boxart where she's shown holding a crucfix with a deep thoughtful expression on her face like she really is prepared to hunt vampires alongside Richter.