Since you've already mentioned Pokemon (my pick also) I acually think that they should give the Animal Crossing Spinoffs a go, maybe minigames that can connect to the mainline games
It has an interesting concept, giant mosquito that swoles its muscles up with blood (I think it's supposed to be blood but this is Pokemon, idk if that'll be kid friendly). But there are far more interesting designed Ultra Beasts out there
Shonen manga. Idk if the quality of it has gone down or if I've outgrown it. I tried giving Dandandan a go, it looks just like something It's love but it just doesn't click with me