Indomitable Will

"I don't care who I have to fight! If he rips my arms out, I'll kick him to death! If he rips my legs out, I'll bite him to death! If he rips my head off, I'll stare him to death! And if he gouges my eyes out, I'll curse him from the grave! Even if I'm torn to shreds, I'm taking Sasuke back from Orochimaru!"

- Naruto Uzumaki

Summary
Indomitable Will (Also called Iron Will or Unyielding Tenacity) is the ability to have unnaturally strong willpower, possibly enabling Resistance to things like Mind Manipulation, Emotional Manipulation, Fear Manipulation, and many other powers. Through their will the user can face great physical pain and psychological trauma and will refuse to surrender no matter how much the odds are stacked against them, possibly up to the point of pushing themselves past their own limitations.

Limitations

 * Willpower Manipulation may enable enemies to bypass this completely
 * Users may be prone to reckless actions
 * In certain shocking situations, users can have their will and spirit broken.

Users

 * Son Goku and Vegeta (Dragon Ball)
 * Finn (Adventure Time)
 * Captain America (Marvel Comics)
 * Ichigo Kurosaki (Bleach)
 * Frisk (Undertale)
 * Natsu Dragneel (Fairy Tail)
 * Mario (Super Mario series)
 * Sora (Kingdom Hearts)
 * Madoka Kaname and Homura Akemi (Puella Magi Madoka Magica)
 * Etcetera...