There is now a train service between Pearson and downtown Union Station.
https://www.upexpress.com/
Once downtown, there are two Toys Toys Toys locations within walking distance (Simcoe Place and TD Center), and a third at Eaton Center (
http://www.toyscubed.com).
Silver Snail is close by Eaton Center as well.
Up Chinatown is AnimeExtreme.