I have kids ranging from high school to junior high to early Elementary school, but they may not be the best example of "what are kids into nowadays" (as I don't give them phones, and we don't have cable - though we do have streaming subscriptions - and I tend to push a "reverence of the classics").
Which means they have a love for all versions of
Scooby Doo, from the original to the recent "Scooby Doo and Guess Who?". They watch Pokemon reruns (from just a few years ago to the stuff from when I was into the show - 20 years ago). They watch
"Sonic Prime" on Netflix. I've let them watch 80's
Ninja Turtles and 80's
"Super Mario Bros".
Going by interactions with other kids, "Bluey" is still the big thing for early grade school kids. The older kids seem to all be into
"Demon Slayer". And
"Encanto" seems to be the last animated film that struck a wide ranging cultural impact. Otherwise, those in Junior High/High School seem to still be riding the wave of "nostalgia" off of the Disney films of the 2010's.
Left to their own devices, my kids tend to watch funny Youtube videos making fun (altering) clips from Disney films or Barbie animated movies, or funny "Let's Play" Youtube channels focusing on "Minecraft" and "Roblox". Stuff like:
https://www.youtube.com/@ItsFunneh and
https://www.youtube.com/@maizenofficial
I think that's the key - kids nowadays are into Youtube/Tik Tok clips, not full TV shows. Which is probably a sign of the Apocalypse.