Hiken, meaning Fire Fist, is best known as Portgas D. Ace's signature technique in One Piece, where his arm ignites before delivering a massive flaming strike. Clips of the attack and its roaring punch sound spread through anime edits, AMVs and soundboards as fans isolated the impact for reuse. It remains popular because it instantly signals an Ace reference and overwhelming power, even in unrelated fight scenes, gaming clips and meme battles far from the original series.