“Kids” in quotations because sometimes “kids” shows aren’t really just for children, judging by their nuanced jokes.
Could be old, could be new.
I like a lot, two that stand out lately are Star Wars: Skeleton Crew, and Star Trek: Prodigy.
Going back a ways, Reboot and Beast Wars. (Reboot, upon relatively recent revisit earlier this year, has a few jokes that I certainly wouldn’t have gotten as a kid nor even as a teen.)
You?


Adventure Time and Spongebob had a lot of stuff that only adults could catch. Also, a lot of shonen anime deal with mature subject matter.
Definitely SpongeBob! I don’t even think this was intended to be a kids show in the first place. Anyhow, SpongeBob is clearly a teenager or even young adult.
I really liked Adventure Time, too. Probably very much intended to be high quality children’s content, suitable for adults as a side effect.
i’ve tried watching spongebob a few times but couldn’t get into it. could you recommend a specific episode?
No specific episode. I can totally understand that somebody wouldn’t like it. First time I saw it was when my 5yo son was watching it, I found it horrible. Many years later I tried for myself and found it increasingly funny. As ever so often, I’d say the first few seasons are best.