The ensemble is a part of a play or musical that most theatre kids dread to be put it.
It's actually a really cool part of the production, and it means you get to decide what their backstory is. They're a blank character that you get to design!
Ensemble Stars (あんさんぶるスターズ), often abbreviated as Enstars (あんスタ) is an idol raising game for mobile devices. While the original Ensemble Stars! featured no rhythm game mechanics, it was later split into two games (Ensemble Stars!! Music and Ensemble Stars!! Basic). While the Basic installment retains the gameplay of the original, the Music installment adds a rhythm game component that plays out similarly to Love Live! School Idol Festival.
"Dude, are you playing LLSIF?"
"Nah, I'm playing Ensemble Stars - I think the gameplay is better."
The top Band in most high schools. All players must audition for this Band, and there is limited seating. Mostly consisted of kids that only listen to classical music, practice about four hours a day, and go to All-State every year.