Marvel Preferences

Bruce Banner
It was the fight for Sokovia and while everyone was fighting and trying to escape, y/n was sitting in the quinjet waiting to be told when she can take off. But, whilst she was waiting she was knocked out from behind and Ultron took control of the ship until the Hulk threw him out of the ship.

The Hulk only noticed her after he hung up on Natasha. He just carried on flying. When she came to she convinced him to go back but not to be an average but just a scientist, he went with her and S.H.I.E.L.D gladly just let him be Bruce Banner the scientist.

Thor
In how you met part 2.

Bucky Barnes
Bucky and y/n had bumped into each other a couple of times and switched numbers in case something happened. A week before y/n was due to have her baby, Bucky got a phone call in the middle of the night from her and answered it straight away. Once he picked it up he heard y/n in pain asking if he could meet her at the hospital for support. Telling her he would he hung up, after getting what hospital she was going to. He called Steve asking him to drop him off, he gladly said yes.

Once arriving at the hospital Steve went to the waiting room while Bucky went to help y/n.

After y/n gave birth, she thanked Bucky for being there and she didn't have to be alone while going through the pain.

Peter Quill
Y/n saw it coming.

One, because her mother was the commander of the Nova crops.
And secondly, because she had been talking to Peter and the guardians of the galaxy for a couple of months.

So when she find herself surrounded by Yondu's men, she was just glad that her mother had Eva for the day. While she was trained in self defence it was only the basics incase of an emergency. Lucky it was a day that she was meeting up with Peter so he could beat them up and give Yondu a piece of his mind.

Scot Lang
When Scot got back to the office he heard shouting again and he knew one of the voices was familiar so he went to see who it was. He was glad he did.

In the room was y/n with her face to the side and a red hand print across her face. Standing across from her was the culprit as he still had his hand in the air from hitting her. Scot quickly made his way into the room and stood in front of y/n and glared at the man before leading y/n out the room and up to her father's office.