That said, yes, Komachi should probably be here as well. She really fits the description. Perhaps she just couldn't be bothered to come pose for the photo?
I dunno, Komachi seems more like a 19-20 year old to me, with Shiki being 17. Not to mention Utusho looking 19 based on the vast majority of fanart. I used to comment on what age range the characters "seem" to be in. If there's anyone else who fits the Old Maiden's Alliance, it would be Mima and Shinki.
This post is referencing the collaboration Hololive did with the LA Dodgers on Friday (which also happened to be Shohei Ohtani's 30th birthday) and likely the food sold at Dodger Stadium.
I'm still having issues with posting assets in comments, but this is a reference to a scene from either Wreck-It Ralph or Ralph Breaks the Internet. It's that one meme with Calhoun and Felix together. I don't have an unedited screenshot, but this is what I was trying to post.
Tagging derivative work since this is Teto's official pose (post #3853931). Normally, this kind of art would be tagged with Vocaloid Boxart Pose but since she's not technically a Vocaloid, I'm unsure if that tag would be appropriate here.