|The following information is from the Adventure Time comic book series. It may not be part of the same canon or continuity as the animated series.|
The Breakfast People inhabit the Breakfast Kingdom, ruled by Breakfast Princess and Toast Princess. They all seem to look like breakfast foods except for Breakfast Princess, who appears to be only wearing breakfast. There may be a cannibalistic reference with the Breakfast People similar to the Candy People. Only the Breakfast Princesses were shown in "Hitman." It is possible that some Breakfast People are also fruits like oranges, similar to the way some Candy People aren't candy. The Breakfast Kingdom itself appeared to be comprised only of the main castle, which may have a bearing on the lack of Breakfast People in the same way the Hot Dog Kingdom has few occupants.