The Merrie Men are the main heroes of the Robin Hood legends, and the several movies, TV shows and other media adapting those legends.
They're a group of people that, tired of the tyranny of Prince John and the Sheriff of Nottingham, have moved to the forest of Sherwood and now act as outlaws, stealing back what Prince John and the Sheriff take away from the people of the kingdom with unfair taxes, and overall fighting to oppose the tyranny of Prince John and giving the kingdom a noble and fair ruler (which, depending on the story, is either King Richard or Maid Marian).
The Merrie Men are Robin Hood (the leader of the team), Little John, Friar Tuck, Will Scarlet, Alan-A-Dale and Maid Marian.
Modern tradition is to add a seventh member to the team, a Saracen. This role has been filled by Azeem, Ahchoo and Djaq.
They preferred weapons are bows and arrows, but they're expert swordsmen, and Friar Tuck and Little John are experts at using quarterstaffs as weapons.