When it comes to Ikebukuro, almost everyone thinks of Durarara.
Vending machines that originally were placed around certain spots in Ikebukuro (see this link: https://news.mynavi.jp/article/20150811-a241/) are now being filled with new bottles that include Shizuo, Izaya, Celty and Shinra, and Mikado and Masaomi. The locations to the vending machines are found on the website itself.