The power to have an abnormally strong and durable skull. Variation of Unbreakable Bones.
The user's skull is incredibly durable and strong, enabling for powerful headbutts to no ill effect.
- User's skull may only be able to endure a certain amount of impact.
- Enhanced strength and durability may be limited to the skull.
- User may have a small brain due to the skull being so thick.
- Wushu Helmet (Xiaolin Showdown)
Luffy (One Piece) defeats Captain Kuro using Gomu Gomu no Kane.
By coating his pointed head with Busoshoku Haki, Chinjao (One Piece) performed a headbutt powerful enough to split open the immensely hard ice plains.
Homer's skull (The Simpsons) is a quarter inch thicker than the average skull which can protect him completely from cranial injury up to a certain point
Devil Boner (Channel Awesome) has 20 metal plates in his head, making his skull immune to all gun-fire.
A master of karate, Princess Fiona (Shrek) delivers a powerful headbutt to Prince Charming as payback for impersonating her husband.
Arale Norimaki (Dragonball) using her famous headbutt on General Blue.
Son Goku headbutts Piccolo (Dragonball) during their final showdown at the 23rd Tenkaichi Budōkai.
Jasper (Steven Universe) with her helmet.
Omni Man (Image Comics) performs a headbutt on a Viltrumite soldier.
Invincible (Image Comics) headbutting Conquest until his face is "mush paste".