This is a topic I already talked a bit about in my introduction post. I had ventured through the world of vintage idols for maybe a year and half when I decided it was time for a break - from vintage, not from the idols. So I decided to follow one of the only recent idol groups I knew, which was AKB48.
After some time browsing their members and songs, I stumbled upon this, at the time, recent group called Keyakizaka46 (欅坂46), the sister group of Nogizaka46, which in turn is the "official rival" of AKB48 (another way to say that the profit ends all in the same pockets). They were about to release their third single when I started hearing about them, and had a seemingly permanent center member called Yurina Hirate (平手友梨奈) (affectionately called "Techi", shortened from "Hiratechi").
With only 14 years old, she passed the audition singing "Hoshizora no Distance" (link to J-Canuck's article), a quite mature song for her age. And that was probably part of what Yasushi Akimoto ended up basing the image of Keyakizaka46 on: a tale of resistance of youth towards the shackles of society. And Hirate ended up embodying that image on stage and in her soul, as she herself says in interviews.