O-Tama (a 8 year-old)
After discovering Luffy is Ace's brother, feels sorry about how indelicate she was when mentioning Ace's promise to him.
Yamato (a 28 year-old)
After discovering Luffy is Ace's brother, says that the proper logic dictates that he should let her in his crew, even thought Ace never promised her such thing.
O-Tama (a 8 year-old)
After starving for several days, cooks her birthday meal to Luffy, proceeds to go drink poison so that he doesn't notice her hunger. Later that day, refuses the food O-Tsuru offers her because she treated her from the poison and Tama didn't want to be a burden.
Yamato (as a 8 year-old)
After starving for several days, eats the only food available to the Samurai that are starving with her, proceeds to do nothing while the one that broke her chains march into an meaningless death.
O-Tama (a 8 year-old)
Goes to Onigashima by herself and executes her plan to turn the tides of the entire raid. We see her talking about how she is afraid, but as long as she can accomplish what she came here to do, it doesn't matter what happens to her.
Yamato (as 8 year-old)
Watches while Momonosuke and Toki burn to their deaths, proceeds to call herself Kozuki Oden.
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and people seriously question why I would want Tama to join over Yamato