Kin'emon and Momonosuke joining eventually makes sense since Oda is trying to fill out the crew using the alphabet. Assuming Vivi, Yamato, Momo and Kin join later. this puts us at 15 filled spots in Oda's Alphabet Crew System. Which leaves us with 11 unfilled spots in the alphabet. This is based on Roger's crew having 26 members without temporary crew mates, apprentices, pets, familiars, or minks. I made a list of characters who could possibly fill one of these eleven slots based off the story so far and their interactions with the other crew members.
- A = Ace (Sabo), Alber aka King, Apoo, Arlong
- B = Brook
- C = Chopper
- D = Dalton, Vander Decken IX, Dragon, X Drake, Duval
- E = Enel
- F = Franky
- G = Gaimon, Mr. 3 Galdino, Garp, Gedatsu, Gin
- H = Hancock, Hatchan
- I = Iceburg, Im, Inazuma, Indigo, Ivankov
- J = Jinbe
- K = Kaidou, Katakuri, Kin'emon, Kuina, Kuma, Kuzan
- L = Luffy
- M = Marco, Momonosuke, Going Merry, Moria
- N = Nami
- O = Oars Jr,, Onimaru
- P = Pandaman, Paulie, Pedro, Pekoms, Pell, Perona, Pudding
- Q = Doc Q, Queen
- R = Robin
- S = Sanji
- T = Tama, Tashigi, Marshall D. Teach
- U = Usopp
- V = Vivi
- W = Wadatsumi, Weevil, Who's-Who, Sanjiuan Wolf, Wyper
- X = Rock D. Xebec
- Y = Yamato
- Z = Zoro