fishmen arc was definitely one of my favorites in one piece bc:
1) talks about prejudice and how much we can hate one another because we are different;
2) also how these differences can cloud our vision and make us become more and more intolerant;
3) the different races (merman, mermaids, tritons) trying to overcome their prejudice and forget the past to build a new future; also to see two heroes trying to make a difference in a world in which prejudice and fear was the most powerful thing WAS SO AMAZING!!
4) how one individual can change other’s minds according to his own and create a war to ‘rebuild’ everything as he wanted;
but the best thing was 5) how we are one and the same under the same sun
the scene in which luffy needs a blood donation and jinbe helps him (breaking a serious law and a huge taboo) - and the narrator talks about the color of the blood and how we are all the same - was SO DAMN GOOD and i never cried so much watching animes or anything, but these entire arc (the characters, the moments, the war, EVERYTHING) WAS SO GOOD!!!
i have no words left right now... as luffy says:LET’S GO TO THE NEW WORLD!!!!!!!!!!!
so yeah, fishermen arc was and will always be my favorite