Masochist (3.5e Trait)
From D&D Wiki
You enjoy the feeling of pain.
Benefit: You get a morale bonus on attack rolls and will saves when your hit points are low.
Drawback: You get a morale penalty on attack rolls and will saves when your hit points are high.
Roleplaying Ideas: You love pain, absolutely love it. You might be the first one to jump into battle or just stub your toe occasionally for fun.