Free agency is a period where teams look to improve their rosters.
They look to do this in many different ways. The first (and most obvious), is to find players that excel in scoring, defense, goaltending, etc. The "star" players.
Those star players always receive a lot of attention, and for good reason, but often times it isn't the acquisition of a certain star that puts a team in a position to win.
Teams can have a lot of skill but still fail to win because they don't have enough "character" guys on their team.
These players can range from fighters that stick up for their teammates to third- and fourth-line guys who work their tails off and make the most of every second they get.
These are some of the top character players that were—or still are—available in free agency.