I hope Pikmin 5 makes Olimar the main playable character again if and when it happens.
In my opinion, there has not been an iconic main character in Pikmin since 2's Louie. 3's cast is fine, but they're pretty forgettable and one note and it's even more true in Pikmin 4's case - I think the amount of castaways lessens the series' trademark sense of wonder and danger, and none of the rescue corps (aside from Oatchi) are memorable at all. It's a minor nitpick in the grand scheme of things because Pikmin's strength is its world and the creatures that inhabit it rather than its actual sapient characters, but still.
In my opinion, there has not been an iconic main character in Pikmin since 2's Louie. 3's cast is fine, but they're pretty forgettable and one note and it's even more true in Pikmin 4's case - I think the amount of castaways lessens the series' trademark sense of wonder and danger, and none of the rescue corps (aside from Oatchi) are memorable at all. It's a minor nitpick in the grand scheme of things because Pikmin's strength is its world and the creatures that inhabit it rather than its actual sapient characters, but still.
Ganondorf and Little Mac are also up there for me, but my ideas of reworking them mainly boil down to changing attributes rather than entire moveset overhauls.