First Person POV is often used when writing humor because it allows the most room for wit and ironic comment about events. Books written in this viewpoint succeed or fail on the ability of the writer to create a likeable main character, one with whom the reader can closely identify.
First Person viewpoint is most often used when the protagonist is involved in scenes of high adventure, such as mystery, mystery-suspense and thriller stories. It’s the POV which lends the greatest credibility to the main character, the best sense of factual events.
First Person is the most intimate POV. It tells the story from the internal viewpoint of the protagonist. Complete knowledge of the actions, thought processes and emotions of this “I” character are included, but excluded are events in which the character has no direct participation.