My first sim, Peach Blossom, is present in almost all my saves. I love her.
She has evolved over the years (with new clothes and hairstyles and such) but she has kept all her facial features untouched (or almost? I can't remember for sure now). I have a few versions of her in my gallery and always go back and forth with the different versions. I always like to pair her up with another one of my very first sims André Joyeux.
They end up together in most of my saves even though they don't usually make very cute looking children :D
Here is Peach Blossom in my current save:
https://i.imgur.com/RBLrSMq.jpg
And here is the original, my first Peach:
https://i.imgur.com/4JgdEd7.png
