Steve- You were at the avengers tower, being babysat by Coulson while your dad was in a meeting. As much as you love your Uncle Phil, you wanted your dad. So, while Phil was distracted, you got up, and slowly but surly walked out the door, to the elevator. "Where to, Miss. Rogers?" Friday said. "Daddy." You responded. Friday understood and took you to the floor your dad was on. You walked out of the elevator, and Clint was the first to notice you. "Um...Steve? I think Y/N is behind you." Steve turned and gasped. "Y/N? How did you get here?" That's when he noticed you walking toward him. "You're walking! That's my girl! I am so proud of you." Steve kept you for the rest of the meeting. Meanwhile, Coulson was freaking out that he had lost Captain America's daughter, and did not find out what had happened for almost 3 hours. 

Tony- Morgan actually walked before you did. When you saw all the attention your sister was getting you had to get in on the action. You, of course, had to outshine your sister, so you started to run. Which did not end up well, as you tripped over Thor's gigantic feet and fell flat on your face.

Bucky: It was the 4th of July, and also Steve's birthday. You, your dad, Sam, Natasha, Wanda, Clint, Tony, and Bruce, and of course Steve, were at the beach to celebrate. You were playing on a beach blanket, but you saw a beach ball laying on the sand just a little bit away. You decided to get up and walk to get it. The sand was a little warm but nothing was going to stop you from getting that beach ball. You walked over there, picked it up, and walked back like it was nothing. What you didn't see, was the look of shock on everyone's faces. Bucky was so proud of you, and he bragged about you the rest the whole day.

Natasha: You were at Uncle Clint's house, playing with his kids. You saw his bow laying on the couch. Curious, you stood up to take a look at it. You then slowly began to walk over to investigate. You never did get to it, because the next thing you knew, your mom was picking you up and giving you a bunch of kisses, so happy that her baby girl was walking.

Thor: You were at the avengers complex with your dad, and you wanted your fathers attention. So, you got up and walked over to him. Thor's eyes widened when he saw you. "Did you just walk, sunshine?" He asked. You put your hands up for him so he could pick you up. He laughed, picking you up. "My princess is growing up so fast."

T'Challa- Your Aunt Shuri was actually watching you, while your parents were busy. You saw some cool gadgets on the other side of the lab. So, you stood up and began to walk. Shuri gasped when she saw what you were doing and began to record you to show your parents. However, when you saw what your aunt was doing, you stoped walking and sat flat on the ground.

Peter Quill- Nebula and Mantis were watching you, but you wanted to hear some music, so you began to walk to where your father's Walkman was. "Look! The young one is using her feet to propel her!" Mantis gasped. At that moment, Peter walked into the room, and smiled when he saw you walking. "That's my girl!" He then started blasting some music to celebrate.