Thanos knows Tony Stark because Stark single-handedly thwarted his first invasion of Earth in The Avengers (2012) by flying a nuke through the portal to destroy the Chitauri mothership, making him the most significant Earthling in Thanos's eyes, a formidable opponent who proved humanity wasn't weak as told. Thanos, a genius strategist, investigated the individual who foiled his plan and saw Stark as a kindred spirit cursed with knowledge, leading to their intense connection in Infinity War.
being cursed with knowledge is realizing that you're smarter then the vast majority of people. Thanos and Tony are the 1% of the 1% when it comes to knowledge and know that listening to everyone else is ridiculous.
The directors literally confirm that. the Avenger Thanos is most scared of is Tony Stark. Not because of his strength, not because of his powers, not because of his suit, but because his intelligence. That is why Thanos says.
“I think [Thanos] has the most specific connection to Tony because Tony is a futurist, and he has predicted a threat like Thanos,” Infinity War director Joe Russo said in an interview back in April of this year. “It's lived in his brain even though he couldn't name it.
The Mark 42 (or XLII) Iron Man armor is special because it's an autonomous, modular suit that can assemble itself around Tony Stark, controlled by microchips in his arms, allowing remote operation and deployment in separate pieces, making it his first "summonable" armor but also prone to malfunctions as a prototype. It's famous for its unique gold-and-red design and the ability to fly in segments to surround Tony, even letting others wear parts of it, though it was still experimental.
What Marvel character does Thanos fear more than anyone? Some might say Thor, or Captain Marvel, because they obliterated his forces and came dangerously close to defeating him.
Ferdz Ceredon the power stone coupled with Thanos' fighting skills, hitting pressure points and shocking him out of anger is the reason why Thanos was able to over power hulk, hulks strength has to develop over time the more angrier he gets, so if you can stop him before he gets that angry it's 100% possible to defeat ...
Disbelieving, Gamora could not comprehend that Thanos ever showed genuine love for her. However, upon realizing it was true, Gamora quickly took her switchblade from Thanos' belt. Drawing it, she attempted to kill herself, only to be fooled by the Reality Stone, opening her hand to reveal only bubbles.
Namor is revealed as the most hated Avenger, struggling with a violent legacy and self-loathing. Namor has been both a hero and a villain, causing controversy throughout his long history. In Namor #1, he must face his past and salvage his legacy while navigating prison and public disdain.
While Bruce Wayne sat at number six with an estimated $9.2 billion, Tony Stark was ranked fourth with $12.4 billion. And though both of these estimates are up for debate, the evidence certainly seems to bear out that Iron Man is indeed the richer of the two.
J.A.R.V.I.S. was replaced by F.R.I.D.A.Y. in the MCU because J.A.R.V.I.S. evolved into the sentient being Vision at the end of Avengers: Age of Ultron, leaving Tony Stark needing a new primary AI for his suit, with F.R.I.D.A.Y. serving as the next step in his AI development, not just a temporary fix.
Another subtle callback to the comics in Endgame: Thanos almost rips Iron Man in half (until he gets hit with Mjolnir)
Iron Man's arc reactor protected him from Loki's scepter, as the scepter needed to touch organic matter to work, and the arc reactor was not skin. In Avengers: Age of Ultron, Wanda Maximoff was able to hypnotize Iron Man without physically touching him or using the scepter, showcasing her immense power.
He knew Tony for a long time. They also fought in a lot of battles together. They were like brothers. On top of that he had all the previous things happened which probably made him even more sad when Tony died.
Thanos was crying because he had to sacrifice Gamora to obtain the Soul Stone. He was crying because she was the person he loved the most in the world, and he had to give her up to accomplish his genocidal plans. The fact that he was still willing to pay the price proved that he didn't love her enough.
Thanos knew he couldn't beat Asgard, so he waited for opportunity. It came as Odin's death and Asgard's destruction. He was WAITING for it.
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He was the closest thing to God at that point that the galaxy had. He basically strolls his way to the finish, getting more and more powerful as the movie progresses. Even his fight on Titan was a foregone conclusion. EG Thanos was still hungry, still vicious because he had to be.
Hulk wasn't scared of Thanos at first, but when Thanos pried Hulk's grip off him and gave him that good punch, Hulk looked embarrassed, scared, perhaps both. The people of Earth for sure affect Hulk mentally as well.
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Thanos is an omega level mutant.
The Hulk has admitted that The Void is the only thing he fears.