I've been thinking about creating "realistic" or "plausible" aliens in my writing. I can't stand that whole Star Trek/Star Wars "everybody is a human but they're a different color" shtick. But I mean something that would actually be plausible given a different environment and intelligence-level. I was thinking about the most efficient form for an intelligent being, whether it be some form of A.I or some kind of biological super monster. I wonder what that might look like? Sure, we have no frame of reference for aliens other than what we've got here on Earth, such as cephalopods and mammals in general. There is one intelligent biological alien species that I've come up with that I think might be a very plausible and efficient being that has evolved to the peak of biology. They are made of several strands of fleshy tentacle muscles that can form any shape they please in order to move or manipulate their environment in any way they need to. That means that they can expand or contract their tentacles if needed. Picture a hotdog but made with several tentacles lined up together vertically that can individually move. Their war machines are filled with a type of yellow liquid that has nutrients in it, the pores that run across their flesh that allow them to absorb the nutrients that grants them a steady supply of energy. They live in this liquid and they can exist outside of it as well although the tremendous supply of energy needed for them to function is what keeps them in this liquid of theirs. They have no such thing as organs with the exception of a brain that essentially runs throughout the entire body. That allows them full control of every part of their body and enables them to regenerate lost limbs simply by thinking it, they can renew the cells in their bodies just by thinking it too by using the nutrients in their liquid for energy to duck decay and live indefinitely. They do not have eyes, ears or any sensory instruments in their bodies. Pain can not be felt, they are only notified through their technology. Their technology has taken over that role aspect for them as they use their war machines as a sensory replacement after trillions of years of evolution. And similar to District 9, they interact with their technology through blocks of goo they can use their tentacles to manipulate every part of the war machine they control as they please by moving their tentacles around in the goo. What do you guys think of this species? Is it plausible according to what we know about biology? What do you think a perfectly evolved intelligent being might look like? Biological-wise and A.I-wise?