Freedom's taste ( one piece x Oc )

I don't owe one piece or the charterers and even the picture ( no all but most 😅)
I owe my Oc's and the plot

Please have mercy on me it's my first book 😖

The straw hats landed on a mysterious isolated island after saving a boy and found mysterious people ,but the only one that stood out of them was a girl that is will known as 'RED NIGHTMARE'.
Will Luffy find good in the mysterious girl ? and will Luffy ask her to join his crew?

Just a warning the characters may be a little OOC