I was also a huge fan of sentai/power rangers/masked rider shows when I was a kid.
I'm not so into them now but if one of my nieces or nephews want me to watch with them it's always "Heck yeah." Not gonna lie they are still cheezy fun to watch, they don't have the same appeal as animated series but I do enjoy them.
Pokemon can be a little hit and miss some filler episodes are just annoying and feel long, but the ones I manage to get into are still fun. 'Science is amazing!!'
Sonic Boom is another one I've been slowly getting through, there's a lot of hit and miss episodes with that one too x.x but it's had it's generally amusing moments.
The current Ninja Turtles series I have a love hate relationship with. I mean I just really love the franchise in general and have been following in since I can remember first seeing it as a kid myself, so I've seen a lot of versions of it. Nicks version has a lot of things I like in it, but also a LOT of things I really dislike because it just ignores the original material while at the same time playing homage to the original material??? They're very pick and choosy. 2003 version of the series is still one of my favourites.
Voltron was also very good but I think that might be counted as an teen cartoon instead of kids (which is general is far more normal for older audiences to watch)
I really need to watch Troll Hunters, I've heard a LOT of good things about it but just haven't had the time to invest in watching it (and my nieces and nephews are too young for that age demographic yet) The HtTYD and Puss in Boots series I wasn't too impressed with.