Here are some of the types of characters that I can do:
A confident, steadfast hero
A tough, authoritative man
Soothing and intimate
Passionate, sexy
Nerdy or neurotic
A smarmy, self-absorbed person
An upper-class snob
A cool, charming ladies' man
Cowardly, frightened, or hysterical
A cold, menacing villain
A monstrous, frightening character
Melancholy, despairing
Goofy and silly
Deranged, insane
Idiotic or dumb
A mad scientist
A slobbish couch potato
An elderly, geriatric man
A wise elder
A gruff and/or weathered man (a war veteran; Solid Snake)
An over-muscled bodybuilder
A hillbilly
A southern gentleman
A cockney British man
A teenage stereotypical valley girl
A campy effeminate man
An upper-class British male
An upper-class American male
A serious or funny news anchor
A stoner
A surfer/skater
A teenage male
A young boy
Accents:
British, Northeastern US, Mid-western, Southern, German
Impersonations:
Jimmy Stewart, James Cagney, John Lennon, Arnold Schwarzenegger, Barney The Dinosaur, Beavis & Butthead (S/T show), Hank Hill, Boomhauer (King of the Hill), Wally, Gus, Kevin, Griffo, Jim (Mission Hill), Sean Connery, Marlon Brando (as Vito Corleone), Bill Clinton, John F. Kennedy, Zapp Brannigan (Futurama).