Here is a concise summary of the provided text:
**Subject:** Blast, the mysterious S-Rank Hero #1 in the One Punch Man universe
**Key Points:**
1. **Mystery Surrounding Blast**: Despite being recognized globally, little is known about Blast's true strength, appearance, and abilities.
2. **Implied Power Level**: Blast's strength is hinted to be on par with Saitama's, with suggestions that he could defeat all S-Rank heroes alone.
3. **Similarities with Saitama**: Both are heroes for fun, wear similar outfits, and have a carefree attitude towards challenges.
4. **Theories on Blast's Absence**:
* Too powerful, would make other heroes irrelevant.
* Possibly transferred his powers to Saitama (speculative).
* Might be the final enemy of the anime, providing Saitama with a long-sought rival.
5. **Future Revelations**: Upcoming webcomic updates may unveil more about Blast and potentially the origin of Saitama's strength.
Here are the key facts extracted from the text, excluding opinions and kept short:
1. **Ranking System**: The S-Rank heroes are the 17 most powerful subjects in the world.
2. **Blast's Rank**: Blast holds the #1 position in the S-Rank heroes.
3. **Character Appearance**: Blast wears gloves, a tight-fitting suit, a belt, and a cape with a flame-designed zipper.
4. **Face Visibility**: Blast's face is never shown, not even in Tornado's memories.
5. **Hair Description**: Blast has bristly, black hair.
6. **Appearance Similarity**: Blast's outfit is similar to Saitama's.
7. **Power Level**: Fu Buki suggests Blast could defeat the entire S-Class alone.
8. **Appearance Condition**: Blast only appears when a god-level threat emerges.
9. **Past Encounter**: Blast faced "The Old One" and nearly killed him, but the opponent escaped.
10. **Comparison to Saitama**: Blast's power is implied to be comparable to Saitama's through various hints and statements.
11. **Blast's Heroic Approach**: Blast fights for fun, similar to Saitama, and doesn't take his work seriously.
12. **Activity Level**: Blast doesn't frequently appear, possibly to avoid making other heroes obsolete.
13. **Theoretical Connection to Saitama's Power Origin**: A speculative theory suggests Saitama might have unknowingly received Blast's powers while sleeping.
14. **Webcomic Update**: The webcomic has advanced, promising more information about Blast in the future.