From top to bottom, left to right the figures are:
Han Solo in Hoth gear; X-Wing pilot Luke Skywalker; Leia in Hoth gear;
Bounty Hunters Dengar and Bossk the Trandoshan; 5D6-RA7 Imperial Espionage Droid; 21B Medical Droid
5D6-RA7 Imperial Espionage Droid
5D6-RA-7, nicknamed Fivedesix by those around him, was an RA-7 protocol droid in service to the Galactic Empire during the Galactic Civil War. Fivedesix was known to be foul-tempered and vindictive for a former service droid, making him feared by other droids.Taken from Wookiepedia21B Medical Droid2-1B surgical droids were advanced medical droids popular across the galaxy to those that could afford them. A 2-1B droid could easily become specialist in neurosurgery, podiatry, pediatrics, cybernetic limb replacement, and alien biology with a trip to a certified service center.
Taken from Wookiepedia
The cyborg Dengar and Bossk the Trandoshan were notorious bounty hunters active during the Galactic Civil War. The two were among an elite group of hunters recruited by Darth Vader to capture Han Solo and the passengers of the Millennium Falcon shortly after the Battle of Hoth.
The Battle of Hoth was a major victory for the Galactic Empire during the Galactic Civil War. The battle was an offensive by the Galactic Empire aimed at destroying the Rebel Alliance's Echo Base hidden on the remote arctic world Hoth. The base's location was compromised when a viper probe droid deployed by Darth Vader landed on Hoth. A major disaster for the Rebel Alliance, the loss of the base put the Rebels on the run once again, struggling to reorganize its battered forces.
Information paraphrased from Wookiepedia
Han Solo, depicted in Hoth gear, managed to escape in the Millennium Falcon with Princess Leia Organa, after a close encounter with an advance group of snowtroopers. Luke Skywalker piloted a T-47 snowspeeder but was shot down, subsequently escaped and headed for Dagobah to a fateful rendezvous with Yoda.