Luffy and Rebecca share a close friendship that was forged in their battle against Dressrosa usurper, Donquixote Doflamingo. Whilst very briefly enemies, Luffy was able to sway Rebecca to see him as an ally and the two quickly became friends. Luffy admired Rebecca's determination to fight even though she is, relatively, weak, and chose to defeat Doflamingo primarily as a promise to her that he would do so. Rebecca became very fond of Luffy and felt indebted to him for having saved her kingdom and help her be reunited with her father.The two originally met in the Colosseum after Luffy defeated Spartan, who had bullied Rebecca repeatedly. Whilst he admired a statue of Kyros, she came up to him to thank him and informed of the history behind the statue. This impressed Luffy and Rebecca briefly bonded with him. Soon enough, Luffy's raw and overwhelming strength became apparent to Rebecca and she saw it as a threat to her goals to defeat Doflamingo. She decided to try and assassinate Luffy but was reluctant to do so, this hesitation allowed Luffy to effortlessly gain the upper hand. After hearing her reasoning, he empathised with her greatly and the two became good friends.The two get on very well. Luffy was quickly won over by her kindness, and even more so when she happily bought him some food to eat. She also rescued him when he was being harassed by numerous other contestants in the gladiatorial games. Even after she attempted to kill him, he held no anger over it as he believed her to be a genuinely kind person. As a result, he was more than willing to hear her out. Rebecca immediately took a liking to Luffy as well, particularly because of his shared interest in the statue of Kyros. It was only because she came to fear his strength that she chose to try and kill him, and even then hesitated. She was stunned when Luffy chose not to punish her for trying to kill him, even though she was more than willing to accept any punishment, which deepened her admiration.
