Below you'll find the adoptables that I've found in my travels on the web. I'll try to check for dead links every so often, but websites often die faster than I can check, so please let me know if a link breaks. Click the link within a section's accompanying text to navigate to the site from which I obtained the adoptee(s).
I got these off of a personal website called K's Cluttered Loft around ~2010 or so. These were definitely not intended to be adoptables, but I just thought they were cool. I was really into playing the original Wasteland at the time (the DOS game from 1988 that inspired the Fallout series), and I remember loving the in-game sprite animations, but my dumb 11 year-old brain just couldn't figure out how to save them into .gifs. I didn't really understand the command line or Photoshop at this time, which was required to dump the animated assets from the game, so I turned to Google. This guy did some cool upscaling before a lot of people were educated on that sort of thing.
I love these adoptables so much. They're so charming, and the color work is stunning! Ninacti0n is one of my favorite personal sites; their art style is wonderful, and they're an exceptionally talented musician as well! Definitely go check out their website and buy their music on Bandcamp.
My TamaNOTchis are all nicknamed after my wife and I, as well as our cats. It's a similar idea as Tamagotchi, but online and a little more hands-off.
Go visit Pedro's site and get your own random choice of adoptables. :)