Not sure which guy in the middle.
There’s the pilot in the chiar, who’s a guy with a big head, there is a robot dude standing pretty stiff in the middle and there is the main alien with the tentacles. He’s in a space suit uniform that has a cape…
The big brain is a snack, I guess. Actually, when they feed they first grow the brain massively so it produces more electrical energy and then start sucking it out.
Below is a different angle with better lighting.