The popular Morning Glory brand of Korean character goods has become so popular in California that its own stores have been popping up left and right for some time now, and are slowly making their way into the rest of the States. This is pretty much the equivalent of the Sanrio store in that they carry their own products almost exclusively, aside from a few Pucca items here and there. They have a mound of stuffed animals at the front (no touching!) featuring their popular Blue Bear and Babu characters. They have countless notebook and portfolio designs for school as well as letter sets, pens, pencils, erasers, lead dispensers, cell-phone straps, and much, much more. The Puente Hills location is usually pretty busy and there are lots of kids running around, so it's a pretty fun atmosphere.
Basically, if you're into this kind of think (think Hello Kitty, and Tarepanda, only Korean), then you'll go crazy. If you're not, you'll be bored out of your mind.