Talk:Blast/@comment-5728015-20190411022228

Blast is Saitama and Tatsumaki's son, sent back in time from the moment of conception when the explosive power of their lovemaking accidentally tore the fabric of the universe (it's also where his hero name comes from - it really was a blast).

He aged in reverse while moving back through time (so, net positive), proxy-living through everything his parents experienced until the moment of his conception, and arrived in the past a fully-grown adult with both of their powers.

We never really see him because he's afraid of altering the timeline and negating his own birth, so he can only show up safely based on what he knows from his parents' memories.

This is my truth, at least until the actual canon-truth is written and revealed, at which point I'll be sad that Saitama and Tatsumaki probably don't have space-time rupturing sexy-time.