a character who participates in much of the story's plot.
a character who has a small role in the story's plot.
a character the reader knows very little about, who seems to not have very many qualities.
a character the reader knows very well, a complex, very human character
a character that fits a certain type that appears often in books, stories, etc. such as a mad scientist.
when an author explicitly tells the reader what a character is like
when an author shows what a character is like by what he/she says, does, etc.
indirect characterization via conversation
indirect characterization via speech to audience
indirect characterization via talking to one's self
indirect characterization via the way one talks and the words one uses