Oh man, this is really difficult! I think i'd keep Elk cause i've spent ages training him to T12 and reading to him/feeding him.
[tot=Ninja]
Rauz. He's my oldest character, who started on Neopets in like 2004. He may not be my favorite species/color but he's my favorite pet still lol.
Gawd, that's a difficult choice. If I didn't quit outright, that is. Roderich has the most money spent on him (big TC, custom overlay/art/layout), Nanairo has the highest stats, and Saya is kind of my favorite character (shh, don't tell the others)... but what would Saya be without all his friends? D:
I guess I'd keep Saya, though. Cause I love him. :/
Def Diprosopus For multiple reasons Plus, he's the smartest!
Damn, this is a hard choice. I guess I'd probably keep Prospero. I have strong ties to his character in The Tempest.
Well, seeing as Kit was my only pet for years, it'd probably be Kit, but this idea is evil. :C
I would keep my golden neela Thorin II Oakenshield. Its gaze is just too much like Thorins. Hmmm, or Sarte, my first pet.
I would easily keep Sirius. He was my only pet for a long time and I tend to be a one-or-just-a-few pets type of person anyway. :x
Oh goooosh. Augh. Um. I've spent the most on Castform, plus Castform is one of my favorite pokemon...and I love bees. But I just adopted Sub, whose name I adore and who I have really great character plans for...
Probably Castform. v.v But I'd weep at the loss of Sub.

Ugh...all my beloved babies gone but one. I would likely keep Syni, as she's one of my very very first and my favorite species/colour combo :)
I would have a very hard time parting with my snails though!
I would definitely keep Namenlos. He was my first pet from my first day on the site. He has the most put into him in terms of training, books, foods etc... I can't guarantee he would stay in his current form, but he would be my keeper. The only thing that might tempt me away is keeping one of my spotlight winners, but I think it would be cheaper/easier to win again than repeat everything put into him.
Rhelex for sure! He was my first pet!
This would be so ridiculously hard buuuuuut I think I'd keep Juneau. I'm just super attached to him and I can't really pinpoint why but yeah this is really hard. ;_;
I would propably keep Jessamine. She's my only pet I take proper care of - food, books, training (only tier 3 tho, decided to focus on battle just about month ago >u> ) and she's oc based on my favourite game.

Man, I think I'd have to keep Folaigh. She's my main baby basically, and the most personal/the one I've put the most work into. But losing Beryline's TC would kill me haha

I'd pick my Luxxa! I made her when I joined ~8 years ago; I couldn't just let her go. ;___;
Just one? Man that would be harsh. I’d say Krysin. She’s one of the pets that I’ve had the longest and she’s also my main battle pet and the one I read most books to.
I would be very upset to lose any of my pets, but I turn most of them into my own characters anyway.
: That image in your signature is adorable by the way!
I'd go with Leia. It's a one of a kind name, and I like the character. I've put in some amount of effort into training her, and honest to god, even though Gandalf is probably a more sought after name I just don't like his character nearly as much.