They're wearing armor sets and wielding weapons from the Monster Hunter series. The guy on the left has Zinogre gear, but I can't ID the other three.

So, they're from the Monster Hunter series, yet you only know one armor set, but not the others.

It looks like the other 3 are from the more recent games, which I'm not very familiar with.

The second one from the left is wearing one of the Guild armor sets and carrying a piece of Well Done Steak.

The third one from the left is either wearing Rathalos or Glavenus armor, with what looks like a Glavenus greatsword.

The one on the right? Yeah, I got nothing. Never seen that armor set, or those Dual Blades.