When Bumgardner designed the Palace, he specifically choose a "cartoony" atmosphere. For example, the balloons that pop out from one's head when speaking is a carry over from the world of comic strips. Bumgardner felt that people would readily identify with this atmosphere and find it intuitively easy to use. The cartoony ambience also fosters a playful regression among users. Bumgardner wanted people to feel like they were "getting away with something" - which surely is a familiar theme in comic strip plots. As a result, it's no surprise that cartoon props proliferate at the Palace. While younger users (adolescents) may be more inclined to don cartoon costumes, older members frequently use them as well. The psychological significance of the cartoon character probably affects the choice made by the user. People select characters with whom they identify or admire. Some cartoon characters have very specific cultural significance and may even represent archetypal personality types (e.g., Bugs Bunny as the confident trickster; Aladdin's genie as the powerful but benevolent friend). Rather than relying on childhood cartoon figures, some adults wear cartoon avs of a more sophisticated style - some of these classified as "anime." The psychological tone of these avs tend to be more seductive, whimsical, or mysterious.
http://www.rider.edu/users/suler/psycyber/psycyber.html