Deshé M.

I'd argue different for Nami, Jinbe, & Robin.

Nami being on the verge of death in Wano and refusing to denounce Luffy as the future pirate king while taking on several headbutts from Ulti was top tier.

Jinbe taking on Big Mom's soul powers unafraid and unfazed was a fantastic moment.

And Robin coming to terms with the fact that she had people to live for and realizing she wanted to live in water 7 might be one of the greatest things to happen in anime history.