Lol. He is easily the worst character in OP. One piece without Luffy will have better tension, world building, believability, and power scaling.
Luffy is just a walmart version of Buggy. Basically, he is just a stupid child just got lucky to have everything destined and equipped to be the pirate king. In orther word, everyone who has nika fruit, luck, and lineage similar to luffy will be able to accomplish the same thing no matter how dump they are.