Danny Darrow

Danny Darrow is a crazed hermit, and the surviving youngest member of the Darrow family.

Physical appearance
Due to his self imposed exile and obsession over his treasure he has grown into a decrepit old man with an unkempt look.

Personality
He is really aggressive because of his treasure.

Skills and abilities
He has unusual skills with traps and uses good sword skills with his hot poker.

Early life
He and his family were fighting over a puzzle-piece artifact that might be a clue to the haunted treasure of the conquistadors, at the time he got his hands on it, an earthquake caused their mansion to be swallowed up below ground.

Scooby-Doo! Mystery Incorporated
He somehow survived there for about 75 years, outliving his family because he was the youngest. When he was disturbed by the old Mystery Incorporated he thought they were after his treasure, and he tried to fill the mansion with traps for them, but they left while he was still working on the traps.

When the gang discovered a way down to the mansion, his crazed mind mistook them for the original Mystery Inc., and he tried to trap and kill them. They managed to escape, and eventually he realized they were not who he thought. He gave them the puzzle piece and let them escape, just as the ground around the mansion began collapsing again. He is presumed to have died in the collapse.

Trivia

 * Danny seems to be loosely based off of Bobby Barrows from Clock Tower.