I just finished an insane binge-a-thon of the entire show. I made a post about it in the general anime thread six episodes in, about I was not really feeling the show, and asked if I should stick to it. Man, am I glad I did. HxH won me over soon enough. This is pretty much my experience throughout the show:
What a great, emotional ride. The Chimera Arc is easily my favorite. The creator must surely be a Speaker for the Dead fan, thematically it reminded me so much of the book. At first I dismissed the show as average shonen, but it really is so much more.
Aside from the main ones, my favorite character was probably Bisky, just cuz she was just so dang funny.
Best moment gotta be episode 131. It's as close as I've felt to pure elation while I watching a movie or a tv show.