I'm not sure if this would count in this particular thread, but this is official art and I wanted to share it.
From Volume 5 of
Tokedase! Mizore-chan. Apparently a gift from Horikoshi. I thought it was really nice considering
Mizore-chan's author's has shown on multiple occasions to be a fan of HeroAca and Hori. Also, the girl on the left apparently wants to destroy the sun and if you've seen some of Horikoshi's recent Twitter sketches, you'll realize why Bakugo of all people being there is really funny.