Viridi from Kid Icarus: Uprising. Sure, she's Really 700 Years Old due to being a goddess, but she has the mind and body of a little girl, and tons of quips at the ready.

Dragon Ball GT has Pan. It helps that Trunks is much more easily scared in this continuity, due to not having gone through the hardships Future Trunks did. A Rare Male Example is Naota from FLCL. The light novel explicitly mentions that his body hasn't kept up with his mental maturity. In the anime, his pajamas don't even fit a 12-year-old girl. He overuses ' ore' to compensate.The Master Key: Rob's little sister, who openly insults his claim to have a flying machine, in front of their parents, and gets away with it. In 1901! Clementine in The Walking Dead has her moments in Season 1. Season 2, however, has her being a good bit more witty, probably as a result of her experiences. Ming-Ming from Wonder Pets! has been known to dip into this from time to time. "Save the Honey Bears" and "Here's Ollie" are two notable examples.

Miura from Yotsuba&! has hints of the trope, though she's more likely to use her insights to manipulate others, rather than just snark. Bleach has Karin Kurosaki, our hero's younger sister. She's the sanest person in the family aside from her brother, and her dad's antics really give her a lot to snark about.In Ma Fille, when Claire reaches her tween years, she becomes very snarky and enjoys provoking others more.