Sanji is also a side character. Lufy and luffy alone is the main character. There has been arcs where there has been no zoro(cake island, boa hancock island, marineford) no sanji(dressrosa, boa hancock island, marineford) no usopp and no nami. Luffy was the only constant. Why is it so hard for some zoro tards and sanji tards to understand, I don't know. They are not the main characters. And yes they are expandable
A badass blind swordsman who summons meteors casually. the "Purple TIGER", the animal that some people like to constantly remind everyone Zoro's based on.
"bu-but my headcanon says kizaru is much stronger because otherwise if sanji fights Aramaki and he's close to fujitora, then people are gonna claim sanji is close to zoro and I cant have that despite the Admiral looking awesome as fuck"