A Third-Person Person is a character who usually or always refers to himself or herself in the third person. Some people are illeistic in real life, and there are some fictional characters who are illeistic. The word "illeism" comes from the Latin word for "that" ("ille").

Some examples of illeistic people and characters can be found here: http://tvtropes.org/pmwiki/pmwiki.php/Main/ThirdPersonPerson