|This needs a stretch.|
* Physical appearance.
* History is incomplete.
Clive Dickerman is a real-estate agent.
Insert details here.
He is a grouchy, mean guy when he told Scooby-Doo to get off of him and called him "mutt".
The Scooby-Doo Show
He wanted to buy the Vulture's Claw property from Professor Greer, but the latter wouldn't sell (or couldn't until he could finalize the sale to himself). Because of this Mr. Dickerman was a possible suspect to be the Mantis since he had a motive for driving Greer away.