- Shanks meeting luffy in the east blue started his journey into piracy inspiring him to become one. Shanks believing he can surpass Roger
- Buggy while an obstacle and enemy to luffy was still an ex roger pirate luffy got to meet at the start of his actual journey. Him being luffy’s first real fight of the series and also one of the last obstacles he had to deal with during loguetown before entering the grand line
- Luffy met crocus at the very beginning of the grand line aka paradise. Crocus believing Luffy might be the one they’re waiting for
- Met Rayleigh at the halfway point of the grand line right before fmi. Him training luffy to fully prepare him for the new world. Him also believing luffy is the one they were waiting for
- Gaban might be the last roger pirate he meets with him representing the next part of luffy’s journey. Rather than going farther into the grand line he could represent them having to go backwards through it. Them no longer needing to go further. He might even be in elbaf after leaving load star
- I don’t remember if they were fully considered Roger Pirates but luffy meeting inuarashi and nekomamushi lead to him finally actively going after the one piece. Finding out he needs the road poneglyphs
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