Colloquialism

• spoilsport

  Someone who spoils the pleasure of others.

• pouter

  Someone with a habitually sullen or gloomy expression.

Also contains

• unpleasant person

  A person who is not pleasant or agreeable.

• intruder

  Someone who intrudes on the privacy or property of another without permission.

• troublemaker

  Someone who deliberately stirs up trouble.

• meddler

  An officious annoying person who interferes with others.

• villain

  A wicked or evil person; someone who does evil deliberately.

• ingrate

  A person who shows no gratitude.

• undesirable

  One whose presence is undesirable; "rounding up vagrants and drunks and other undes...

• disreputable person

  Someone lacking public esteem.

• tease

  Someone given to teasing (as by mocking or stirring curiosity).