"LUFFY!"

The Strawhats yelled, shocked, as Luffy went into the sea. They were busy with the Marine attacks, so they couldn't save him in time. Luffy struggled in the harsh hold of the sea as his body went limp. The last thing he saw was the dark depths of the sea until giant glowing eyes stared at him. He was awoken by a loud, powerful roar. A big figure rose from above the sea, making the Marines to retreat at the sight in fear.

You, a giant Sea King mermaid; protected the Strawhats.