@Gorlom:
Who was the "beauty"/"pet owner"/"conis" of Thriller Bark?
The only one I can think of is Perona owning bearsy as a pet… but she was a villain as well.
Well, I would actually argue that role was filled more by the Chief of the Victims association. He's the one who explained Moria's presence on the ship, the nature of shadow stealing, etc.
True he lacked a pet, but there were sufficient filler "pets" that arc like the cheshire cat and cerberus.
@Davy:
I dont think its safe to assume each arc follows the structure, Oda might throw something new into the formula(though I have seen the trend) but it doesn't mean that I think she'll join-just thought id give my opinion
That's certainly a valid point, and we can't truly assume anything not explicitly stated in the manga as canon. However, the only way to make accurate predictions in this manga is to base them off patterns discovered earlier in the story. Oda's free to change course anytime, but he is more likely to follow the previously set patterns.
For example each arc has been organized as so:1.Introduction 2.Development 3.Plot Twist 4.Fights 5.Luffy's Victory 6.Recuperation/Travel to new arc.
Considering that these themes have repeated so frequently, it would make sense to predict that future arcs will follow the same patterns.