This Little Twin Stars magnet was part of my Sanrio 50th anniversary set. Growing up, I totally remember Little Twin Stars being more popular than Hello Kitty.
Apparently, the twins were born on the Star of Compassion - Kiki (the boy) uses a star on his back to fly around, while Lala's special skill is cooking. (Cooking?)
They came to live on Earth because they were curious, having heard all about Earth from Father-Star and Mother-Star.
Now, they roam around spreading happiness and joy to all they meet!
I can't find any additional information on the twins...nor could I find any cartoons to link to, but here's a fun Little Twin Stars blog to check out.