Spend enough time in the 'Tokyo Revengers' fandom and you'll see Draken and Emma pop up in ways the original didn't have time for. The canon gives us these incredibly solid foundations—the unshakable loyalty, the quiet protectiveness, the shared history that's more family than anything else. But they're both so busy being pillars for Mikey that their own interior lives, especially Emma's, can feel a bit secondary in the main plot.
That's where fic writers come in. I've seen a lot of stories that take the aftermath of a big canon event, like a fight or a loss, and use it as a pressure cooker. Instead of just being tough, Draken might be written struggling with the weight of leadership he never asked for, doubting if his strength is enough. And Emma isn't just the cheerful little sister; she's navigating what it means to care for someone as famously closed-off as Draken, learning to be patient with his silences, finding her own kind of strength that isn't about throwing punches.
It's rarely a smooth, linear 'and then they grew' arc. The best ones I've read have them taking two steps forward and one step back, miscommunicating because they're both used to putting Mikey or Toman first, accidentally hurting each other while trying to help. The emotional growth feels earned because it's messy, built on small moments of vulnerability they'd never show anyone else. A fic that just makes them immediately perfect for each other misses the point; the beauty is in the chipping away at those hardened exterior layers, finding the scared kids underneath who are terrified of losing what they have.