Your eyes aren't deceiving you - that's a character stuck in the background of April 16's Nightwing #300 who looks one heck of a lot like Yuji Itadori from ultra-popular manga/anime Jujutsu Kaisen.
This is, of course, almost certainly an unofficial meeting between Jujutsu Kaisen and the DC Universe - more of an homage than an actual crossover. But it's a great nod to the ongoing tradition of stories featuring young, powerful heroes learning the ropes of their abilities in both western superhero comics and in manga.
