"What is "courage"? "Courage" is knowing fear and making that fear your own!"
― Will A. Zeppeli (JoJo's Bizarre Adventure Part I: Phantom Blood)
"How are you doing this? You've ingested enough toxins to drive ten men insane! What are you?!"
― Scarecrow (Arkham Series)
"Courage isn't the absence of fear, but the presence of fear and the will to keep on going."
― Jamal Walker (Black Knight)
"There’s no way a man who intends to join the crew of the future Pirate King will cower before a mere Yonkō!"
― Jinbei to Charlotte Linlin/Big Mom (One Piece)
"I've been running and running to get away from those hideous people for 2 years. Compared to them, this monster is nothing. It looks rather cute to me."
― Sanji (One Piece) on the Kraken.
"Fear is the enemy of will. Will is what makes you take action; fear is what stops you, and makes you weak. You must ignore your fear. When you're afraid, you can't act - you can't act, you can't defend - you can't defend, you die!"
The user is capable of suppressing their fear and drawing upon superhuman reserves of courage and/or fearlessness allowing them to act/react normally in dangerous situations like combat, rescue operations, etc.