Answer by taking a quote from the following article:

Aykroyd was born on Dominion Day (July 1), 1952 at The Ottawa Hospital in Ottawa, Ontario, Canada. He grew up in Ottawa, Canada's capital, where his father, Samuel Cuthbert Peter Hugh Aykroyd, a civil engineer, worked as a policy adviser to Canadian Prime Minister Pierre Trudeau. His mother, Lorraine Helene (nee Gougeon), was a secretary. His mother was of French Canadian descent and his father of English, Irish, Scottish, Dutch and French ancestry.

Aykroyd was a close friend of John Belushi. According to Aykroyd, it was their first meeting that helped spark the Blues Brothers act. When they met in a club Aykroyd frequented, he played a blues record in the background, and it stimulated a fascination with blues in Belushi, who was primarily a fan of heavy rock bands at the time. Aykroyd educated Belushi on the finer points of blues music and, with a little encouragement from then-SNL music director Paul Shaffer, it led to the creation of their Blues Brothers characters. Backed by such experienced professional R&B sidemen as lead guitarist Steve Cropper, sax man Lou Marini, trumpeter Alan Rubin and bass guitarist Donald "Duck" Dunn, the Blues Brothers proved more than an SNL novelty. Taking off with the public as a legitimate musical act, they performed live gigs and in 1978 released the hit album Briefcase Full of Blues (drawn from the fact that Aykroyd, as "Elwood Blues", carried his blues harmonicas in a briefcase that he kept handcuffed to his wrist, in the manner of a CIA courier; Belushi originally carried the key to those handcuffs). Briefcase Full of Blues eventually sold 3.5 million copies, and is one of the highest-selling blues albums of all time. The band was much further popularized in the 1980 film The Blues Brothers, which Aykroyd co-wrote. Early in the incarnation of the Blues Brothers, Belushi joined the Grateful Dead on stage on April 2, 1980, for a rendition of "Good Morning Little School Girl" at the Capitol Theatre in Passaic, New Jersey that coincided with the Dead's appearance on SNL that weekend. Belushi sang the part usually carried by the late band member Ron "Pigpen" McKernan. Cherokee Studios in Los Angeles was a regular haunt for the original Blues Brothers in the early days of the band. Belushi and Aykroyd became fixtures at the recording studio, while fellow Blues Brother Steve Cropper called Cherokee his producing home. Whenever they needed a bass player, they were joined by another Blues Brother, Donald "Duck" Dunn. During this time, Cropper, along with producing partner and Cherokee owner Bruce Robb, worked on a number of music projects with the two comedians/musicians, including Belushi's favorite band, Fear, and later Aykroyd's movie Dragnet. The Blues Brothers Band continues to tour today, both with and without Aykroyd. The band features original members Cropper and Marini, along with vocalist Eddie Floyd. Aykroyd sometimes performs as Elwood, along with Belushi's younger brother Jim Belushi, who plays "Brother Zee" on stage. They are most frequently backed by The Sacred Hearts Band.

What characters did they portray?
Aykroyd, as "Elwood Blues",