Professor Arthur Hawkins, known as Arthur Hopkins in the Japanese anime, is the American best friend of Solomon Muto and the grandfather of Rebecca. His original Japanese name is kept in the English video games.
When Kaiba tried to buy Solomon Muto's "Blue-Eyes White Dragon" card, Solomon refused, saying it was given to him by a dear friend. In the manga and first series anime, a photo of Arthur and Solomon is visible as he says this.
He is briefly seen after Rebecca finishes her duel with Yugi Muto, Arthur then proceeded to Duel Solomon.
Waking the Dragons
His major appearance is in the Waking the Dragons arc. Arthur was first seen in the Domino Museum, investigating the history of Atlantis and the Orichalcos. He gives information to Yugi concerning both of them and is instrumental in discovering the location of the lair of Dartz. Mr. Hawkins was later captured and knocked by Dartz's gang. Yugi, Rebecca, and the others manage to save him, but to their disappointment, Arthur's research laboratory was burned to the ground. He didn't lose much hope and kept on trying to help Yugi and his companions. Arthur later noticed that his granddaughter wanted to go on a trip with Yugi, but he said that the trip was too dangerous for her to go.
Arthur is seen Dueling with Yugi's grandpa during the flashback when Yugi and Rebecca, though not much of his Deck is shown. His Deck is similar to Rebecca's focused on Shadow Ghoul" and its effect to acquire a high ATK value. He also owns an Ancient Deck like Solomon Muto, but it is is incomplete.