How about the qualities of the next nakama. It could help identifying the next nakama before it is official.
Have Jinbe's been answered? Has this been addressed somewhere in this forum?
http://onepiece.wikia.com/wiki/Straw_Hat_Pirates/Miscellaneous Jinbe
Animal Resemblance: Whale Shark
Specific Number: 10?
Specific Color: Turquoise or Coral
Specific Smell: The Sea
Favorite Type of Island and Season: Spring on a Spring Island
Favorite Food: Japanese seafood
As a Family: Uncle
Genderswapped: ?
Nationalities: Japanese(same as Zoro)
Inner Brain: Pride, Honor, Karate, ?, ?
Suited Flower: Amazon lily, Parrot's feather, Seaweed? lol
Blood Type: B
Bathing: every day(fishman lol)
List of unique/interesting traits not taken by current members that I think are plausible
Animal Resemblance: Chinese Zodiac Animals, Bear, Eagle, Mink
Specific Number: 11 or more
Specific Color: Gold, Silver, Copper, Gray, Brown
Specific Smell: ?
Favorite Type of Island and Season: Summer on a Summer Island?
Favorite Food: Mexican(Tacos, Burritos), Italian(Pizza), Breakfast
As a Family: Aunt, Grandmother, 2nd Daughter, Cousin
Genderswapped: ?
Nationalities: British, Irish, Mexican, Chinese, German, Italian, Australian, Jamaican, Indian, Spainish, Egyptian
Inner Brain: Work, Obey, Dance
Suited Flower: Gardenia, Lilac, Orchid, Venus Fly Trap, Cactus Flower, Lotus
Blood Type: B and AB if all is even then two more members after Jinbe
Bathing: Never