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- Saitama is Blast. No, Saitama is much younger, Blast has Hair, they have different philosophies of helping people, only in black and white manga they have similar outfits.
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- Blast is a relative of Saitama. Possible, needs more evidence.
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- Blast is Mob from "MOB PSYCHO 100". Unlikely, but needs more evidence.
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- Blast is just new character. Most likely, still needs more evidence.
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- Blast does not exist. No, in 7 page 106 chapter of Onepunch-Man (Webcomic) he is shown.
These are probably all significant theories about his true identity
so you can now post in this forum instead of spamming on Blast's page comments section. :)