pukunui
Legend
They have been. Skewing more towards the teenage end of kids but there are some younger ones (like Wanda's boys; all those Asgardian kids in Thor 4, not to mention Love; that new magical child in GotG 3).Touche should have added kids to the MCU/Star Wars stuff.
Star Wars, again, skews more towards the older kids (e.g. Ezra, Lieda Mothma, etc), but the new Visions series includes some kid heroes, and then there's that whole brand new Young Jedi Adventures series.