What organs or muscular system would a Klyntar alien symbiote like Venom need to move freely as to appear almost or completely liquid? It needs to be able to rearrange, operate without a skeletal system, and be capable of formidable strength.
I was inspired by the Klyntar and came up with a system. I am not sure how well it'd work, but here it goes.
The symbiote is made up of many small cells like earth life, but they are all connected by a matrix of long chained molecules similar to PolyEthylene Glycol.
PEG is a 'self-syphoning fluid' i.e. it can 'pour itself'. This fluid is not a liquid but a kind of 'molecular spaghetti'.
Our symbiont would be held together by something like this. The cells pull the chains taught or even retract them completely to contract, and they let the chain slack to expand.
This obviously wouldn't be particularly sturdy. Perhaps the cells, when needed, secrete a glue or epoxy-like substance to harden and create a temporary bone/shell.
This would depend on the pulling ability/speed of the cells and the strength of the chains.
The symbiote doesn't rearrange itself per say. Each cell is something like a stem cell but reversible and fast. What looks like a face is actually just the same cells as the surrounding tissue just reconstituted.
So, it simply dissolves(?) the old limb and replaces it somewhere else giving the illusion of the limb being moved.