Why is Ace always talking to himself?

In the meeting room of the headquarters in Marinford

Warring States: "Ah, it's not what we wanted. Didn't we say Ace would be killed by Whitebeard before? How come he became Whitebeard's son? He also became the captain of the squad. The combat power of the Whitebeard Pirates has directly increased."

He: "Whitebeard still loves talents. It's okay to burn his pirate flag. But this makes the Whitebeard Pirates more prominent. The other emperors should unite and it's impossible for him to dominate alone."

Warring States: "Increasing Ace's bounty is really a troubled time. This sea is going to be in trouble again. It started to get chaotic."

Warring States: "Ahhh, Garp, you're stealing my senbei again."

Garp: "Ah, what's wrong with eating some senbei? Go buy some more."

Warring States: "Garp, why don't you buy them yourself?"

Garp: "The ones I bought myself are not as good as the ones I got from you."

Ghost Island

Kaido returned home and found that his house had been robbed. He learned that it was done by the current captain of the second division of the Whitebeard Pirates. He was very angry. He couldn't beat Whitebeard, so he could only vent his anger on Wano Country. Wano Country began a period of misery.

Big Mom Pirates Cake Island

Big Mom: "Mom, mom, mom, it's a pity that you went to Whitebeard's side. I'm hungry, it's tea time."

Red Hair Pirate Ship

Red Hair: "This little guy actually got on Whitebeard's ship."

In 1520 of the Sea Calendar, at the port of Windmill Village, a man was wearing a small red vest, blue denim shorts, flip-flops, and a straw hat around his neck. He is Monkey D. Luffy, and today is the day he turns 17 and sets sail.

Luffy: "Hahaha, Ace, here I come, the Pirate King must be mine."

Not long after Luffy started to travel, Ace received Luffy's bounty order.

Ace: "30 million Baileys, my useless brother has also set sail. Unfortunately, my current goal is not to become the Pirate King, but to make my father the Pirate King."

On this day, the Second Division and the Fourth Division found a devil fruit after killing a pirate group. The discoverer was Marshall D. Teach. He gave the fruit to Thatch and let Thatch deal with it.

Ace: "Aye, didn't you say that Marshall D. Teach would kill Thatch and defect after seeing the fruit? Why didn't he make any move and took the initiative to hand over the fruit he found?"

Aye: "This one looks like a banana, and he is waiting for the one that looks like a pineapple, spiral-shaped, and dark purple. If he wasn't waiting for that one, of course he would continue to lurk."

Ace: "So stupid?"

Thatch: "Ace, my dad just sent you a message asking you to go on a mission with the Oz Pirates and the 10th Division. Please take this fruit back with you."

Thatch handed the box containing the devil fruit to Ace after he finished speaking.

Ace: "Sachi, can I not go? I want to stay with you."

Sachi: "Hey, don't. I don't like you. This is the first time that Dad has assigned you a mission. It would be embarrassing if you don't go."

Ace: "Okay."

Ace pulled Sachi to a corner and whispered: "Sachi, you must pay attention to Marshall D. Teach. He is very dangerous."

Sachi: "Okay, I will pay attention."

After that, he led his squad to continue patrolling.

Ace: "Hey, I don't know if he listened to me."

Ai Ye: "Just kill him if I say so. Then you don't have to worry."

Ace: "Why would I be so nervous if I could kill him? I don't want the warmth I finally felt to be gone."

Ai Ye: "Then hurry up and complete the mission. I hope that the fruit won't come out during this period."