There is an awesome writing team on Wattpad who post on the account Septiplierbum, and one of the writers named Pey created an adopted daughter character named Piper and they've unintentionally made an official adopted kid character for the Septiplier fandom on Wattpad. Unfortunately, that has led to writers on the site using Piper as their own without permission and even saying they created her. I didn't think that happened in fanfiction, so it's weird to me.
I did this in micron, colored pencil, pencil, and that's about it :/
Anywho, for the Mark and Jack essence, she's wearing Mark's Lucky Flannel (given to her in a story), a Booper Dooper shirt, a warfstache clip, and holding a Septic Sam plush.