James Tynion:
"I remember, a few years back, right when I had first gotten wind of the creation of the Middle Grade and YA lines that DC Comics was developing… I approached the editor in charge of the program with an idea. I wanted to do a book with the energy of a Shonen Manga, that told the story of Bruce Wayne travelling the world and training to be the world's greatest crime-fighter… I don't think I ever wrote up a pitch document, but I do remember laying out the core cast in a notebook. There was a cowardly thief style character, a young woman who may or may not have escaped from Themyscira, but the character that had really instigated the whole idea was Bruce's Rival. The key to that idea was to create a Zuko to Bruce's Aang. The Gary Oak to his Ash Ketchum. The Draco Malfoy to his Harry Potter.

I'll be blunt. My initial ideas for that character were pretty basic. The rough concept I had played around with in the Shonen series pitch was that young Bruce was a bit of a scamp, more of a Robin type character, so his rival would be the more serious type. But that dynamic wouldn't work in the present. He needed to be something more. He needed to be a fascinating inverted mirror to Batman… And he needed some flair. And a name"

I'm neutral. Shonen rivals dynamic can either be great:


Or downright annoying:


Apparently marvel already has an edgy japanese inspired Rival with same name too.