Okay so I did like when the Infinity stones had a kind of… affect on the people around them/interacting with them. This is kinda a nothing observation post but its important to me
Tesseract/Space Stone was most evident, it was temperamental and "Talked" in a way to Loki and Selvig. It sparks an interest. I see it was, kinda like the ocean in the eyes of a sailor, kinda relating to -naut in a sailor capacity in the odd sense my brain comes up with.
It behaves, it acts up, there's infinite depths to explore in its power and magnitude and entirely unfathomable how much power it could give us. It is an ocean in the palm of someone's hand and it can cause just as much destruction on a whim as any body of water could, this body just so happens to be the literal universe.
The Mind Stone is a different case. It has its affects, all different depending on the person, but how I've always interpreted it was amplifying a trait or part of someone's personality. On Selvig it made his scientific curiosity into frenzied fanaticism, which shines through most in his talks to Loki while building the portal machine and how he reverently speaks to Natasha while he's firing it up. Clint the minute he's touched by the stone switches entirely to Good Soldier, his mind control shifts his loyalties and focuses him entirely on The Mission in firing the portal up and helping Loki. Loki himself is more hateful, his anger and cruelty is amped up to an 11 where he is his most consistently devious and schemes more than any other appearance. They are all twisted into the worst version of a certain part of themselves for the point of the goal when it has direction.
Without direction, when Hydra points it at Wanda and Pietro, it amplifies existing abilities by apparently giving Pietro his speed and canonically getting Wanda using her magic again that hasn't been messed with since she was a child. (Honestly, with the Norse connection the Tesseract had, Pietro's case reminds me of that bit of the myth of Utgard-Loki where Thalfi races the personification of Thought in a footrace.) Wanda's magic acts like a emotional defensive response at first so I can see why the Mind Stone got it acting again with her. Hell, it amplified the Jarvi AI into near full humanity when applied to Vision.
With the Aether it literally fed off of Jane when it was attached to her and caused a few hallucinations, literally altering the reality around her and making her have trouble perceiving her own. It's a parasite that eats at what it gets close to and seems to have a penchant for destruction itself, always reacting violently when something got close to Jane while it was attached.
The Time Stone didn't have as much but I'd say it behaves like a system or tool, will is exerted on it without much difference from what was wanted and what happened. It acts less 'alive' than the other ones.
The Power Stone is similar, but hasty. The minute it has contact with something it tries to burn through it and tries quickly, so if I were to give it a personality like the Aether or Tesseract I'd say it's like something viral or murderous.
Lastly with the Soul Stone, it seems mocking. It demands a price, "You want me, give up someone else. Someone you care about. Eye for an eye." When Thanos holds it there's this whisper, when he uses all the stones it mocks him with the image of Gamora asking him if it was worth it. It's petty, its mocking, and it didn't like what Thanos had to do with it. It's a lot of souls gone in an instant.
And honestly? I freaking love that they all have some sort of personality to them. I want to indulge this somehow.
