It's probably worth noting that if you've only seen the Akira movie and not read the manga then you've only seen a miniscule (
almost inconsequential) portion of Tetsuo's power and abilities
The film only covers the first part of the manga and shows Tetsuo in a state where he has very little control over his powers
Tetsuo is a character that can:
- survive in an absolute vacuum
- teleport instantly to the moon - then effortlessly wreck it, just to prove a point
- read minds
- control and, more importantly, react to things moving at the speed of light
- generate forcefields
- create artificial body parts out of machines/fuse with machines or, regenerate lost limbs (Akira, not Tetsuo, has shown the ability to reconstruct himself from his component parts - and although it wasn't shown in the manga [so is pure conjecture], Tetsuo, by the end, is far closer to Akira's powers, than he was in the film)
- create brand new universes/induce a new big bang/destroy the current universe (though, it could be argued he didn't intentionally risk that)
he's an
incredibly strong telepath - who controls the power of the universe itself (as in:
the power of everything)
the
only character stronger in the manga [Akira] is Akira himself - and it's arguable that this is only due to the
degree of control over their powers (they are both using the same 'force', in the end - and both have the potential to
break the laws of physics)
Now, it's not mentioned for Tetsuo - but Akira has certainly moved
past the being constrained by the laws of physics
People have a tendency to underestimate Tetsuo, purely because they've only been witness to a much reduced and far less in control Tetsuo (as shown in the movie) - a character that needs to use medication to maintain control, is easily hurt when he loses it, and ends up almost destroying everything when he does so
Tetsuo from the Akira manga series is a whole 'nother beast
Nothing that Sephiroth did in FF7 came close to the level of what Tetsuo was capable of, as far as I'm concerned
Forgot to mention that he can also displayed feats of becoming incorporeal/intangible (think he also displayed something
slightly similar in the film, though I can't really remember)