The Phantom on the left (our left, not theirs), its name is Ghost. The Middle Phantom is Harro, then last but not least is Torme, the one that looks like he is going to die from happiness. Each Phantom has its own personality (as you can see in their reference image). All of the Phantoms control the main body so you can imagine how awkward that would be once trying to go in certain directions (Like Barf and Belch from HTTYD)