If you would like to make Halloween costumes for three or four people, here are some fun ideas.
Decide if you want to dress up as the same thing, such as a gang of pirates; as complementary things, such as Disney princesses; or as a famous three- or foursome, such as Mickey, Minnie, and Pluto.
To dress up the same, consider being members of a famous band or sports team, people of the same profession, or a gang of some type (ninjas, Pink Ladies, etc.).
Complementary Halloween costumes could be different farm animals, cowboys and Indians, or various superheroes and their sidekicks, lady lovers, or villains. Browse through your books and movies to find more characters, such as from Star Wars or Peter Pan.
Some famous trios include the Three Stooges, the Three Little Pigs, the Three Bears, the Three Blind Mice, the Flintstones, the Rubbles, Huey/Dewey/Louie, Harry Potter/Hermione Granger/Ron Weasley, Alvin and the Chipmunks, and the Cat in the Hat/Thing 1/Thing 2 (or the two children).
Some famous foursomes are the Fantastic Four, Incredibles, Ninja Turtles, Wizard of Oz crew, children from The Chronicles of Narnia, and animals from the movie Madagascar.
For more foursomes, include other people related to the trio ideas, such as adding Ginny, Luna, or Neville to the Harry Potter team; the wolf to The Three Little Pigs; Goldilocks to the Three Bears; Dave to Alvin and the Chipmunks; and the Flintstones to the Rubbles (no Pebbles and Bam Bam).
If you have a baby or two, involve them in the Halloween costume. Or ask older children if they would like to be part of a family Halloween costume. If you are going as two couples, then read my article on Halloween costumes for couples for more ideas.