Karl keeps Sapnap's and Quackity's names on his arm on a tattoo so he doesn't forget them after he time travels.
Quackity and Sapnap have known eachother since they were kids- I like the awesam family headcannon where George is Quackitys brother, and George and Sapnap were friends.
![](https://img.wattpad.com/cover/289915009-288-k529643.jpg)