For accents, I can do Russian, Slavic, Spanish, French (québecois), Jamiaican, Black American, Southern American, Eastern Canadian.
As for impersinations, I do many, such as
Vin Diesel
Heath Leger
Denzel Washington
Barack Obama
Al Pacino
Robert DeNiro
Joe Pesci
many Family Guy characters (Peter,Quagmire, Brian, Chris, Tom Tucker, Joe, Adam West, Mort)
many Transformers (Optimus Prime, Megatron, Ironide, Trailblazer, Waspinator, Rumble)
WWE superstars (The Rock, Stone Cold, Hulk Hogan, Macho Man, HHH, Jim Ross)
alternative rock singers (the lead singers from Pearl Jam, Stone Temple Pilots, Creed, Limp Bizkit, NIN, Marcy Playground, Puddle of Mudd)
Rappers (Lil' Wayne, Method Man, Lloyd Banks, LL Cool J, Dr. Dre)
video game characters (Nikko Belic, Hitman, Max Payne)