Board Thread:General Discussion/@comment-24319911-20160701130131/@comment-72.92.209.161-20170715192223

This is mostly speculation but heres my theory.

Blast is Mumen Rider.

Somehow, he lost his abilities a few years ago (The same abilities that Saitama miraculously acquired during 'training') and despite losing his powers he still strives to be a hero as Mumen Rider