U need to be totally obsessed with one of the most insignificant scenes in Star Wars 2(episode 5) to know any of those characters names other than boba fett, I couldn't get a picture of the scene, its in the original and the gayed version (AKA the only version available on DVD, u need to get VHS if u want the REAL star wars):
Robot on Far Left: IG 88 B (there are 5 IG 88's A, B, C, D & E)
Robot Under IG 88: 4-LOM, Zuckuss' Assistant, Looks like a Protocol droid but will kill you if you make that mistake.
Lizard Monster: Bossk, a Trandoshan, Trandoshans enslaved the wookies on thier homeplanet of Kashyyk under an exclusive slavery deal backed by the Empire, so naturally they both hate each other.
Next to Bossk (Right side): Zuckuss, a force sensitive Gand allien with strong mental and psychic abilities but one punch in the face could shatter his breathing mask and potentially kill him, but that is of course if he hasn't turned your brain into mashed potatoes by the time u swing.
Bandages McGee (above Zuckuss): Dengar, a Kessel Run legend, previous holder of the fastest kessel run time before Han Solo shattered his record. The race in which solo broke this record is also the reason Dengar wears so many bandages, he is still recooperating to this day from the crash, he presumes solo is the cause of his accident (because they both raced that day) which is why he immediately took vader's offer to capture solo.
Jango Fett Jr. AKA: Boba Fett, no explanation needed here.