This layout organizes all the dota 2 heroes by their main role in competitive play. It also uses datdota.com statistics to rank them by viability, meaning that the most popular hero of each category are top left and decline in popularity as you move right.
1. Non-CM heroes Earth Spirit, Ember Spirit and Legion Commander are put last, regardless of any hypothetical competitive viability.
2. Woods and Offlane are somewhat merged, because many of the heroes can do both, but also to preserve some space, otherwise all icons would have to be smaller.
3. Where heroes can fit multiple roles, they are put in the role that most competitive teams will use. For example Alchemist is run as both hard carry, support and solo mid, but is most popular mid, therefore put there.
4. This version uses data from December 19th through January 19th and will be updated again february 19th.
Hero Roles and Competitive Viability as of January 19th