Did you even wonder who I used to be?! When Pearl is not able to activate it, she assumes that it is broken. However, when away from Pearl, Lapis Lazuli reveals herself to Steven by talking to him through the mirror's recordings. Lapis is then able to communicate with Steven, persuading him to free her. Steven releases her physical form and individual consciousness by removing the gemstone from the back, shattering the mirror.
Peridot - Wikipedia
It might be filler, but it's got all of the feminist messages and humor of the regular series. Plus, it's always great to see Lapis and Peridot have some fun for once. Supplemental stories provide focus on characters rather than the main plot. It matches the tone of the cartoon exactly. The humor is excellent.
What Your Favorite “Steven Universe” Ship Says About You
Apparently more than you, you clod! There's so much life, living here. That's what I'm doing! I've been learning new things about myself all the time! Like how I can make metal do my bidding!
She was originally a Homeworld Gem technician and a certified Kindergartner. After being stranded on Earth following the events of " Jail Break ", she acted as a recurring antagonist until becoming more of an anti-hero and pseudo-antagonist by establishing a truce with the Crystal Gems in " When It Rains " to help them save the Earth from the Cluster. She officially became a member of the Crystal Gems in " Message Received " after she defied and insulted her Homeworld superior, Yellow Diamond.