A lot of people say it would be Blackbeard, but I'm not entirely convinced.
One thing that I feel Oda has made very important is the importance of conqueror's haki. This has been portrayed as the world's greatest power and it is specifically Luffy's greatest power. Luffy's greatest rival should be a CoC master and be able to split the sky with him; as WB did with Roger.
The issue here is that Teach doesn't have CoC. Some people might theorize he has it because he is a yonko, because he wants OP, ect. But the fact remains:
So if not Teach, then who? I guess Kid might come to the mind of some people, since he does have CoC. But I think he is disqualified for obvious reasons. While Kid does have CoC, Oda seems unwilling to develop this aspect of his character in any regard. Kid didn't use CoC once, despite fighting kaido and big mom. He doesn't have ryuo and hasn't even been seen using hardening on panel. I would love for him to return in the final war with ACoC, but Oda is awful about haki and makes it exclusive only to certain characters; the mid trio surpassed the tobi roppo without haki, so I feel like Oda will do the same for Kid/Law and the top tiers. Oda will probably make Kid a top tier by turning him into magneto or something.
While Teach and Kid are the rivals of Luffy which fans give the most attention to, neither are masters of the strongest power in one piece; CoC. Therefore none can truly be Luffy's greatest rival.
imo, Luffy's greatest rival is going to be one amongst 2 characters:
Then there is Imu. Imu is the king of the world, he is above even the admirals and the fleet admiral. If you consider the world government to be his crew, he has the strongest crew in one piece. With this much power, he could truly be the strongest CoC user in OP history. However, my reservation with him is that he is more or less a faceless villain. As a result, I think it wouldn't be satisfying for him to be the conclusion of a 1000+ chapter manga that took over 20 years to serialize. Rather, imo it would make more sense if he was defeated by side characters like Sabo, Dragon, Kid, and Law, probably a combination of all 4 of them.
Overall, I'd say shanks is the best contender for Luffy's greatest rival, followed by Imu, and then Teach.
One thing that I feel Oda has made very important is the importance of conqueror's haki. This has been portrayed as the world's greatest power and it is specifically Luffy's greatest power. Luffy's greatest rival should be a CoC master and be able to split the sky with him; as WB did with Roger.
The issue here is that Teach doesn't have CoC. Some people might theorize he has it because he is a yonko, because he wants OP, ect. But the fact remains:
- Teach has never shown CoC, not even in marineford when he should have used it if he had it
- if Teach had ACoC and could split the sky, he could have become yonko with his own strength and would have never needed 2 DFs
- Teach isn't confirmed to be a conqueror, while Oda is willing to easily confirm others(ect. Kid, Sengoku, Hancock) without them even using it in the manga
So if not Teach, then who? I guess Kid might come to the mind of some people, since he does have CoC. But I think he is disqualified for obvious reasons. While Kid does have CoC, Oda seems unwilling to develop this aspect of his character in any regard. Kid didn't use CoC once, despite fighting kaido and big mom. He doesn't have ryuo and hasn't even been seen using hardening on panel. I would love for him to return in the final war with ACoC, but Oda is awful about haki and makes it exclusive only to certain characters; the mid trio surpassed the tobi roppo without haki, so I feel like Oda will do the same for Kid/Law and the top tiers. Oda will probably make Kid a top tier by turning him into magneto or something.
While Teach and Kid are the rivals of Luffy which fans give the most attention to, neither are masters of the strongest power in one piece; CoC. Therefore none can truly be Luffy's greatest rival.
imo, Luffy's greatest rival is going to be one amongst 2 characters:
- Shanks
- Imu
Then there is Imu. Imu is the king of the world, he is above even the admirals and the fleet admiral. If you consider the world government to be his crew, he has the strongest crew in one piece. With this much power, he could truly be the strongest CoC user in OP history. However, my reservation with him is that he is more or less a faceless villain. As a result, I think it wouldn't be satisfying for him to be the conclusion of a 1000+ chapter manga that took over 20 years to serialize. Rather, imo it would make more sense if he was defeated by side characters like Sabo, Dragon, Kid, and Law, probably a combination of all 4 of them.
Overall, I'd say shanks is the best contender for Luffy's greatest rival, followed by Imu, and then Teach.