Stone is the name of a number of fictional comic book characters appearing in books published by Marvel Comics.
First appearing in Daredevil #187, Stone was the favored pupil of Stick, the blind former mentor of costumed crime-fighter Daredevil and Elektra Natchios. He is a member of the Chaste and is a highly trained martial artist and assists his sensei against the Hand. Like the other members of the Chaste, Stone is deeply advanced in the art of chi-manipulation. An offshoot of this is his ability to render himself invulnerable to physical harm - but only if he sees it coming.
He has appeared in Daredevil (vol 1) on various occasions; once where he is told to take Daredevil and Black Widow to safety while his comrades Shaft and Stick sacrificed themselves. Later he famously assisted Daredevil as the Hand attempted to resurrect Elektra as their agent. He managed to restore Elektra and cleanse her soul using Daredevil's love for her and a portion of his own life force. This weakened him and he was believed dead. Later, Daredevil found him still battling the Hand, in the miniseries Daredevil: Ninja.
Stone is an enemy of Spider-Man (See Styx and Stone).
First appearing in X-Men (first series) #137, Stone is a Canadian mutant, real name unknown, who was involved in Project Wideawake, and the mutant-hunting Hounds. He had the ability to transform his body into high-density stonelike material, in which form he gained superhuman strength and durability.
In the Ultimate Marvel Universe, Stone is the female sensei of Elektra Natchios, having taught Elektra since Natchios was a young girl. In a flashback in Ultimate Avengers 3, Stone is seen with a younger Stick, Shaft, and Matt Murdock under the guide of Anthony, a former vampire hunter turned martial artist.