"starcaller" and "the light of the land" are my favorites - the former because i've always loved space, and the latter just... sounds great and "important".

my current one is "sylph-friend" because, when i first encountered the sylphs in the story, i was instantly fond of them. i was really happy to find out there's a title that was exactly what i wanted to be, and i started working on it as soon as i unlocked beast tribe dailies. it's not the coolest title but i like it a lot.