Here's some item ideas for you:
Elephant Tuna - The power of the elephant tuna is amazing, it's taste even more so. Eating the tuna will give you increased life regeneration and amplified strength for 5 minutes.
Pirate Lunch Box - 5 Charges. Having everything a pirate needs; meat, meat, and more meat, plus a small portion of vegetables and rice. The pirate lunchbox heals 100 hit points with each charge used.
Devil Fruit Encyclopedia - Based off the research of Navy Scientist, Dr. Vegapunk, this book lists all known devil fruits, their strengths, and their weaknesses. Carrying it in your inventory gives you plus 5 to intelligence and damage.
Pirate's Songbook - Full of songs sung by pirates on their journeys, this book gives the holder the buff, 'Musician'. This buff is like an aura, increasing nearby allies health, mana regeneration, and agility.