Novel & Cerita Did Ace Have Conqueror's Haki

Looking at Ace's fights in the main story, I don't think we ever see him consciously use Conqueror's Haki in a direct offensive way like Luffy or Kaido do. He definitely has it—the vivre card info confirmed he's a conqueror. But his battles in the manga and anime, against Blackbeard and Akainu, rely overwhelmingly on his Devil Fruit power and physical brawling.

That said, the potential is fascinating to consider. He had the willpower and charisma to lead the Spade Pirates and become a Whitebeard commander. If he'd lived longer, maybe he'd have learned to coat his attacks with it, turning his 'Hiken' fist into something even more devastating. His battle style was always so aggressive and fiery, it feels like a missed opportunity we never saw those two aspects of his power combine on panel.

Ultimately, his story was cut short, so 'effective use' in battle remains a big 'what if.' It fits his character, though—his strength was more about the raw, burning passion he inspired in others than a refined, domineering force.

I'm genuinely shocked by how many people seem to think this is still a matter of debate. Ace absolutely did use Conqueror's Haki. The whole purpose of that flashback in the Marineford arc, the one with him and Luffy as kids protecting each other, was to show that they both possessed the same rare quality from a young age.

Think about it. He was the son of Gol D. Roger, who was arguably the most dominant Conqueror in the series. It's inherited, or at least the potential is. The story shows Ace knocking out the Bluejam pirates when he was desperately trying to save Luffy. That wasn't just rage; it was a burst of his will overwhelming theirs. Oda didn't animate a special effect like he does for Luffy's later uses, but the narrative intent is crystal clear.

To say he didn't have it ignores the entire thematic point of his character. He was destined for greatness but chose a different path. His will was so strong it clashed with Whitebeard's for days. If that's not the mark of a Conqueror, I don't know what is. People get too hung up on the visual cues from the post-timeskip animation and forget that the concept was introduced more subtly earlier on.

I've gone back and forth on this. The first moment we see him use it is at Marineford, but that doesn't mean he couldn't have had it dormant before. Roger's crew was full of monsters, and Ace had insane potential. He had the will and the bloodline for it, obviously. But I lean toward no, he awakened it later. His whole arc is about stepping out of Roger's shadow and becoming his own man; unlocking Conqueror's feels like a part of that growth, a declaration of his own worth. If he'd had it as a kid on the Moby Dick, I feel like we would've gotten a hint, or Whitebeard would have commented on it. The way it erupts when he's utterly enraged protecting Luffy feels like a first awakening to me.

That said, Oda loves his parallelisms. Luffy awakened his facing down the Boa sisters. Maybe Ace's first true spark was in a similarly desperate, protective moment. We just never got the flashback panel of a young Ace making a crowd faint on some random island.