Witch Queen aka Lady Azarni from Scooby-Doo:First Frights!. The boss from the last episode (4) also my favourite. I will write the info in the comments. She is actually the only monster that turned out to be real. source#VideoGame#ScoobyDoo
She used the disguise to terrify the baron's food festival and scare him and everyone else away from the castle. After a long battle against Shaggy Rogers and Scooby-Doo, The Witch Queen was defeated, however, Mystery Inc. didn't get the chance to unmask the monster as the castle collapsed soon after the fight. In the aftermath, the gang revealed they believed Lady Azarni was responsible, since all the clues point to her.
