[Discussion] Kizaru light fruit hehe

[Mellanoma]

Funny thing about Kizaru and his devil fruit is that he is limited due to his human body.

While true that his devil fruit is light and light speed is beyond human capacity.. Their are some penalties to this...

1) Light at it's fastest has no mass meaning it can't do any damage whatsoever so kizaru moving that fast to harm someone is impossible has 0 mass = no damage

2) The beams that Kizaru shoots aren't in essence just light.. It's simply energized and powered up protons light which has energy + mass and thus loses it's speed. Perfect example is a laser which is light but charged up and more powerful.

3) When Kizaru says kicked at the speed of light.. What he is essentially saying is that his kick is not moving at the speed of light. Its that the impact is accelerated at the speed of light which since light has 0 mass once your mass is calculated in the target will be moving much much slower although still going pretty fast to be hurt. It's sort of like a railgun however your mass will determine velocity


Hope that clarifys some things

 

[OG sama]

Wow this really makes sense.

 

[Prometheus Beta]

1) You don't need mass to do "damage" but you do need it to exert a "force" in the traditional sense, where a force involves macroscopic collision of matter (or ordered transfer of kinetic energy between massive matter at the molecular scale). With energy in the form of photons, you can still do "damage" but you'd do damage in the way that gamma radiation does damage (damages your cells). Theoretically, I suppose you can keep increasing the frequency of the waves until you get very rapid cellular damage but if Kizaru could do that, he would be an electromagnetic waves man and not (visible) light man.
Caveat: Its actually possible for light (and electromagnetic waves in general) to exert "pressure" but as I understand it, the mechanism behind this (radiation pressure) is different to how massive matter exerts "pressure" and Im not sure if somehow you can equivalently exert a "force" and any force with radiation pressure (perhaps someone whos studied optics in depth here can elucidate this point) - in which yes you can do "damage" in the traditional sense of the term I guess.

2) Protons are hadrons and have nothing to do with light. Photons (the particle nature of light) only exist at c (the speed of light) and can't ever gain or lose "speed", now light itself in the form of propagating electromagnetic waves can change "speed" when traversing some medium but this has to do with the technicalities of how the phase velocity of waves is defined and not the speed of the photons themselves. Lasers work through what is called optical amplification, too complicated to explain here but it is definitely not light being "charged up" and "more powerful". To "cut" something you need to break the intermolecular forces holding the material together at whatever point, however once again the process/mechanism with lasers (transfer of energy via interaction of photons with massive matter) is different to mechanical cutting (transfer of kinetic energy between massive matter).

3) You can't ever accelerate anything to the speed of light c. If you try it with massive matter, after some point, most of the energy you put in goes to the mass of the object (the thing will just get more and more massive); in the mathematical limit as the energy you put into accelerating a massive object tends to infinity, its speed tends to c, but of course infinite energy is physically meaningless so the situation is also physically impossible. The only thing in the universe that moves at c is light itself (and em waves in general) and it never accelerates or decelerates, it can literally only exist at speed c.

Tl;dr fiction is fiction, Physics is Physics and usually they don't go together very well.

 

[ultraChalk]

His body isn't human anymore, it's a body made of light with human functions, but not all properties.