Space Stone

Thanos with the power/space stone vs Superman with blue lantern rings

Remember in Endgame when the Avengers are discussing where the stones had been throughout their history? Well someone found something interesting in the info the team had on the Tesseract

In the bottom left corner there's a picture of Werner Reinhardt/Daniel Whitehall From Agents of S.H.I.E.L.D.

You can't see it in the film itself, but it's cool to know the connection is there

I would like to know if this gem actually work? Because I heard it was to peserve some soul inside the gem. But if a soul die inside the gem or not?

I haven't even finished Phase 2 of the Marvel Cinematic Universe yet, so proceed with that grain of salt. Although I do know several other things (due to spoilers (No offense))

This may not be helpful, but it is an interesting connection. So in the One Shot for "All Hail The King", we learn that the guy, Trevor Slattery, was cast in a TV series. With a monkey. In Captain America (I think the sub-title is "The First Avenger"), right around the scene where the army recruits are heckling him, he leaves and draws what looks like a circus monkey in a notebook. So Captain America may have watched the TV series that Trevor was in. It is something.

This next one is a real theory. So (also in Captain America: The First Avenger) in the beginning of the movie, the fake Tesseract is in a secret compartment in a tree painting. Also, in Thor (the first Thor movie), we learn that Thor's father described the connection of the worlds as a tree's roots. Expanding upon this, since the Tesseract is the Space Stone, and the Stones are called the Infinity Stones, I had an idea that the job of the Space Stone, or maybe all the Stones, was (or is) to expand the universe. To infinity. I hope this helps. Thanks for reading, please let me know if this changes anything!

Time and Space are obviously opposite concepts. But none of the others are opposites. So what if there were opposites for the other 4? For Reality, Imagination. This one would randomly create anything the user imagines whereas Reality changes what is already there. For Power, Weaken. This one would strip energy from enemies. For Mind, Body. This one would be able to manipulate someone on the biological level, controlling any and every cell with a whim. And for Soul, Death, which would allow the user to kill others temporarily. Imagination would be White, Weaken would be Cyan, Body would be Magenta, and Death would be Black.

Power Stone

Space Stone

Reality Stone

Soul Stone

Time Stone

Mind Stone