Theme restaurant/cafe ?

My children, both girls (7 yrs old and 3 yrs old) are very excited on our trip to Osaka and Tokyo. They keep asking about fun places or themed restaurant/cafe. Besides, Disney parks, Puroland and Universal Studios, any places that's worth visiting? My 7 years old girl loves Hello Kitty and Rilakkuma. Thank you.

Legoland is fun for kids of all ages! http://www.whereintokyo.com/dbinx/kids.html

Also, Osaka aquarium is fun. I don't know that theme restaurants would be all that interesting for kids though.

Thank you, Umami Dearest.

The Moomin cafe at Tokyo Skytree would be good if they like Moomin.