"Love of my life", "my best friend" etc are just names for the tiers. If you think that in your ranking system a character is at the top of your list and is your favorite, then you should vote for S tier. If you think that a character is good but not your favorite, then it's A tier. And so on (only exceptions are E tier and H tier, I think that they just kind of represent mixed feelings).
The picture and description are taken from Supernatural wiki
I think I added everyone I wanted and everyone people requested (I don't think I'll be taking requests for more characters). So I guess I finished it. Wohoo!
How funny is it that Supernatural wanted to replace Castiel with Anna as the angel to guide Dean through the Apocalypse. And Dean and hers romance would parallel that of Sam and Ruby's. But Cas was too popular. And beloved. So they killed Anna and left Cas. And so Cas and Dean's relationship ended up paralleling Sam and Ruby's roman-- [gunshots]