Ah that Natsu. So controversial. I always thought of him as the main guy. I wish I'd put someone else in that question now. And with Vash....yes you are correct. I haven't watched Trigun in 20+ years so my memory is bad. Apologies. That was my error....but his vow still exists so we'll just roll with it ^_~
Yes, I understand. I have answered this question many times. I think of him as main character, other people say Lucy. If I could change this question I would.
I guess it could be Lucy or Natsu. I've not read the manga so I don't know if it's different there. I always thought of it like Lucy is the 'narrator' and Natsu is the 'hero'.