Petra

Petra is a recurring character in Julia-BM's YouTube/Comic series, who just so happens to be a tween who had hit puberty. Her first comic appearance is "Julia Likes Minis", where Petra asks Julia a silly question. She is played by Julia herself.

Her first video appearance is this: https://www.youtube.com/watch?v=rHvWy9ZQEBw

In her first cartoon appearance, she eavesdropped on a party hosted by a neighborhood bully named Tess.

Quotes
"Most of the girls in my class are acting really weird"