Warning! Spoilers ahead for Black Clover chapter 320!
Everything changed the moment Black Clover both revealed Yuno's true identity and where Asta's grimoire actually came from. Fans understandably believed before then that mangaka Yūki Tabata created Asta to show that someone who isn't gifted can still become a hero. Much like Deku inheriting One For All in My Hero Academia because he was born quirkless, Asta possessing no magic explained why the five-leaf grimoire chose him since he could safely wield anti-magic. Meanwhile, Yuno was meant to undermine the entire system. But it's now clear that the former message is only partly true while the latter is now no longer relevant at all.
Way back in chapter 233, Black Clover revealed that Yuno isn't a peasant. He's actually royalty — a prince hailing from the Spade Kingdom. This, therefore, explains why Yuno possesses so much magic and especially why he received a coveted four-leaf grimoire. Before that moment, Yuno was an exception to the belief that only royalty and members of nobility are truly gifted with powerful magic. Mere commoners, especially peasants, could never amount to anything as a mage. They could definitely never become a Magic Knight. Yet, Yuno's air magic (and Asta's anti-magic) helped them not only join a Magic Knight squad but even the Royal Knights. Yuno went even further by becoming a vice-captain within a matter of months. Now, as of chapter 320, Yuno has come to save Asta againstLucifero, the King of Devils who even seven Magic Knight captains can't defeat. But Yuno only accomplished these feats because he's royalty.
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