Accents and Dialects, many are stereotyped but most can sound authentic:
American Southern (Texan, Georgian, Missippian)
American Northern (Minnesotan, North Dakotan)
American Eastern (Boston, NY)
Spanish
Irish
English (Cockney, London)
Scottish
Russian
Indian
Australian
Characters - These range from serious to humorous to bizarre:
Young boy or girl, more of cartoon variety than serious/authentic
Adolescent male or female, can be serious or humorous with male voice, mostly humorous with female voice.
Adult male or female, mostly humorous
Elderly male or female, humorous or serious
Other - These include unclean vocal sounds such as growls, grunts, and squeals that could be used for monsters, aliens, or zombies in video games, TV shows, or movies.
Extra low voice drop, the same effect that is created by pitch shifting a normal voice to make it sound extremely low. Similar to devil or Satan characters in cartoons.
Low growl or grunt, modified from death metal growls and grunts to create monster sounds.
Gurgles, by manipulating the saliva and phlegm in my throat I can produce a variety of horror movie-themed sound effects.
High pitched growls and grunts, these are the higher version of the dirty, distorted, low grunts and growls listed above. Similar to the voices of orcs or goblins in science fiction and fantasy works.
Cartoon Voices - these are voices that are more humorous and less realistic
Meatwad & Gollum/Smeagol, there is a certain range of voices that can be created by shutting off a certain part of the throat to create a nasally voice. This technique can be seen in Aqua Teen Hunger Force's Meatwad, The Lord of the Rings' Gollum, Stitch from Lilo & Stitch, or Futurama's Nibbler.