The One Punch Man Onsoku no Sonic figure captures the lean electric presence of the daredevil ninja in a compact 130 mm form. The sculpt emphasizes a taut, athletic silhouette with a sleek, fitted bodysuit and subtle folds that convey motion even at rest. Fine line work highlights the determined eyes and angular features beneath a lightweight mask, while the hair is sculpted to imply speed and focus. Layered textures on the outfit, a dynamic stance, and optional posing accessories convey Sonic's signature agility and precision. The paintwork uses sharp contrasts to bring out depth and character.

Speed-o-Sound Sonic is a recurring, enigmatic antagonist-turned-ally in One Punch Man, famed for his incredible ninja training and lightning-fast strikes. He relishes challenging worthy opponents and measures progress by the elegance of his techniques rather than sheer power. Sonic's rivalry with Saitama is a running joke about depth versus simplicity, yet his skills remain undeniable, capable of weaving complex combos and precise blades of shadow-like energy. Across battles, Sonic's code of honor, pride, and occasional respect for his rival develop, revealing a layered personality beyond the flashy moves.