Portgas D'Ace

You were an ally of Doflamingo. One day he entrusted you with a mission, as he wanted to kill Whitebeard. Your mission was to capture Ace Fire Fist, the head of Whitebeard's second division, one of the strongest.

Your mission was going well; you knew exactly where Ace would be and at what time, so you went. But something went wrong. The entire Second Division was with Ace, and when you tried to stealthily take him away, the entire fleet attacked you, and for the first time, someone defeated you.
Right now you were tied up in front of Whitebeard, you were on the main ship and next to Whitebeard was Ace, the commander of the first, third and fourth divisions