Yes, I know very well that the Powerpuff Girls are technically triplets, having been created by Professor Utonium. Since they didn't appear in the "normal" way, technically there's no youngest, oldest, or middle child. So we have to go through their creation ingredients first to last. I could say that Bubbles is the oldest triplet because the sugar that represents her was made first, Buttercup is the middle triplet because the spice that represents her was made second, and Blossom is the youngest triplet because the everything nice that represents her was made last. Many people think that Bubbles is the youngest because of her sweet and sensitive personality, and Blossom the oldest because she is the most responsible and mature, but it's important to remember that not all older, younger, and middle siblings act accordingly. There's no question about Buttercup; she's basically the middle sister acting like the middle sister. But in the case of Blossom and Bubbles, it would be something like this: Bubbles is basically the oldest sister acting like the youngest sister, and Blossom is basically the youngest sister acting like the oldest sister, basically like Dipper and Mabel from Gravity Falls. At least that’s what I think is how it should be.

Powerpuff girls in sibling order?