According to answers.com Merlin, the inventor of roller skates, passed away May 4, 1803 in London.
John Merlin Powis Smith died in 1932.
The person who acts as Merlin's friend Will is: Joseph Dempsie
John Joseph Kitchen died in 1973.
John Joseph Mackenzie died in 1922.
John Joseph Graham died in 2000.
John Joseph Boardman died in 1978.
John Joseph Cantwell died in 1947.
John Joseph Nilan died in 1934.
John Joseph Lynch died in 1888.
John Joseph MacDonald died in 1986.
Joseph John Richards died in 1956.