Professor Plum

A character from the board game Clue. Always killing other players or getting killed, often by candlesticks and such.

He's very forgetful but rather smart in a professor type of way.
In fact, he's discovered cures for every disease on Earth. Unfortunately, he forgot them 2 minutes later.
His favorite color is purple.

See also:Mr. Body, Mr. Green, Colonel Mustard, Miss Scarlet, Mrs. White, Mrs. Peacock, Clue, A. E. Parker