hi pookie🩷 this is such a simple question but the answer is complicated,, sorry :3
my favorite arc, as in the one I've enjoyed the most, is between Impel Down/Wano/Egghead, but I firmly believe that the best arc stays Water 7 saga
You can't make me choose only 1 character (╥_╥) so I'll j list my all my faves : my 3 wives (Wani, Cora, Katakuri), Law, Luffy and Kidd🫶 I also love Shirahoshi, Doffy and Baby5 ,,,,, I could keep going but I'll stop here :P