The ghost resembled Abraham Lincoln wearing a gray tuxedo and top hat with a black stripe on it. He had a yellow glow around him.
He was easily angered and tended to grunt a lot.
The New Scooby-Doo Mysteries
While investigating the haunting of the White House, the gang found a room filled with painted portraits of the Presidents. They had been removed from their frames and replaced with the ones with the eye-holes upstairs. When Shaggy Rogers found the portrait of Abraham Lincoln, Scooby-Doo briefly imitated him, but Lincoln's ghost appeared and chased the gang away.
Later, the Ghost of George Washington stole a computer tape with NASA's space lab plans on it. The gang chased him up to the roof. Washington's ghost tripped and dropped the tape, causing it to unravel. With no time to lose, he quickly picked it back up and boarded a helicopter where Lincoln was waiting for him. The two ghosts took off, but due to the unraveling of the tape, some of it was caught dangling out the door. Shaggy and Scooby got caught on the helicopter, so Scrappy-Doo, the President, Daphne Blake, and Velma Dinkley all took another chopper to chase the ghosts. Scooby started to slip off, so he grabbed onto the dangling computer tape, causing it to wrap around the Washington Monument and crash the helicopter.
The ghosts retrieved the tape and continued to run off with it. Scrappy, the President, Daphne, and Velma landed their helicopter and pursued them on foot. Jessica Byline and her cameraman followed the action as the gang chased after the ghosts. Suddenly, Mumsy-Doo and Dada-Doo flew over them in another helicopter. Mumsy-Doo tried to drop Scooby's galoshes to him, but they landed on Lincoln and Washington's heads, making them fall into the water. The ghosts were unmasked as the ambassador and his wife, who were spies trying to steal secrets about the American space program.