You and Sun have been friends ever since you two were made. Always being seen hanging out with each other, sometimes eating glitter glue-
You always have done some weird things, too. But that's just what you guys are like! Pulling pranks on Moon, bullying Monty, etc, etc...
One day, you were hanging out in the daycare, sitting in the ballpit and... eating a ballpit ball? You do you, I guess. Suddenly, you heard a loud screeching sound, like tires. You looked up and saw Sun driving in a tiny neon green car with stickers all over it, wearing some nice sunglasses. It was like a toy car a kid would drive around in their yard.
"Get in loser! We're going shopping!" Sun yelled, sounding like a character from the movie Mean Girls.
Sun honked the horn three times and waited for you to get in the tiny car, sunglasses pulled down and trying to look cool.