than a chosen one by plot
They're all chosen.
Ever read Animorphs, where one of the books mentions Crayak accusing the Ellimist of stacking the deck of who he put together (but in story 'met randomly') to defend earth?
That's basically the same as Luffy's crew, a stacked deck.
Captain from the D clan, grandson of a marine hero and son of the revolutionary leader and holder of the fruit destined to be Joyboy.
Descendant of Ryuma and Shimotsuki clan, plus other things we'll probably learn.
The only Vinsmoke with morals and
possibly a Lunarian or also D. Raised by GL pirate.
A navigator raised by a marine who probably either has some ties (Did you know Bellamarre was one of the names for the fabled alchemist Saint Germain in history? Hmm)or Nami's unknown parentage.
Son of the RHPs Sniper with possible giant ties.
Adopted son of an old lady who knows a little too much about history than she let's on. Genius with devil fruits.
Last survivor of Ohara. Sought by many.
Apprentice to Roger's shipwright, with TBA pirate parentage.
Crewmate and captain of a pirate crew, and ties to a TBA kingdom.
Captain of Fishmen pirates, and a warlord.
Who's not chosen by plot or fate?