How about "YAMASHIROYA" in Ueno.
You can buy trend toys(like star wars), comic character's goods,cards,puzzules ,games ,figures,and dolls.
From babies to adults can buy toys.
Hakuhinkan Toy Park in Ginza is one of the most famous toy store. It is a six stories toy shop containing both Japanese local toys and foreign toys.
Akachanhonpo is a chain store of selling all kinds of products especially for babies and maybe up to three years old. Stores are in Kinshicho, etc.
If you go to any department stores, there is at least half floor dedicated for toys. Such as Mitsukoshi, Isetan, and Takashimaya.
You can also find Toysrus in Ikebukuro, Odaiba, etc.