it's way more slippery than just picking the 'big three' from the 2000s. People point to Oda, Kishimoto, and Kubo, and sure, their influence on pacing and battle systems is undeniable. But if you're talking about what defines the current landscape—the tone, the pacing expectations, the specific blend of humor and hype—I think you have to go back a bit further. For me, Yoshihiro Togashi's work on 'Yu Yu Hakusho' and especially 'Hunter x Hunter' is the real turning point. He took the tournament arcs and power levels of the 90s and injected this crazy strategic depth and moral ambiguity that basically handed a toolkit to every shonen author that followed. The way he writes battles as psychological puzzles rather than just energy blasts changed everything.
Look at modern hits. You can see Togashi's fingerprints all over 'Jujutsu Kaisen's cursed techniques, which are basically Nen with a horror coat. 'My Hero Academia' owes a huge debt to 'Hunter x Hunter's exam structure and its focus on a non-traditional, sometimes unconfident protagonist. Even the way series now play with subverting shonen tropes feels like a direct response to Togashi's willingness to break his own systems. Meanwhile, 'One Piece' feels like the last pillar of a more classic, adventure-driven style, but its world-building complexity is what everyone tries to emulate now. So I'd argue the modern genre is defined less by one titan and more by this tension between Oda's endless, interconnected world and Togashi's deconstructive, rules-based battle philosophy. It's why everything post-2010 feels either like a love letter to one of them or an attempt to merge both approaches.