I'm reviving this thread because I find it relevant and interesting. Also there are a lot of questions I want to answer.
I wonder, how do people know which fruit to eat? I mean, is it possible to know what exact abilities are provided by a perticular fruit? Or you learn this only after you've eaten it?
I believe that this question was already answered in this topic, but I'll go at it again.
There is a book on DF that exists. This how Sanji knew about the invisiblity fruit that he wanted so bad and how Black Beard knew about the darkness fruit. Now how people know what the fruits look like and how it correlates to what they do, I have no idea how that's done.
for example.....he just let us see his new Gear 2/3 form.... how long is he able to do that.....nobody(just ODA) knows.....
but the important thing is...that he couldn't do it right from the start....
Gear 2, he was able to do that only after the first part of his fight with Bruno. All gear 2 is, is Luffy's "flashy" name (you know how he REALLY like cool looking/sounding stuff) for being able to apply the movement the CP9 does (if forget the name of it, the hitting 10 times before moving thing) to everything he has, as well as making his combat moves not actually hit but letting air shockwaves (like the CP9 leg kick i forget its name again). Hence why he thanked Bruno for being able to encounter him first, confirming it was possible to move like that and to see exactly how he did it.
Gear 3 i dont know though, it could be a pre-existing form, or just an application of everything he learned from the CP9 movement and compression and such, not much is known bout how it actually functions enough to make guesses.
The Gear 2 is a bit more complicated than just copying the foot work done by CP9. Using his body he channels a lot of oxygen and blood into the folds created (They look like pumps/springs) to accelerate his blood flow to incredibly fast pace. Something that would be technically impossible without his rubber body being able to withstand the force of his blood rushing through his body. This quickened blood makes it easier for oxygen to reach his cells, and thus they can perform more efficeintly.
My theory on the steam is as a result of the sweat evaporating because of the heightened body temperature that he maintains while in Gear 2. Now based on this, we know the boiling temperature of water is 100 degrees celcius or 212 degree ferhenheit, but this is when water just starts to boil, Luffy's has sweat goes instantly to steam. This means he has a body temperature a couple degrees higher than the boiling point already. It's amazing that his body can even withstand that kind of heat without major side-effects. This is all supposing that my theory is true (it makes sense, kind of xD)
The speed is Soru and the leg kick is Rankyaku.
Gear 3 is a mystery at the moment...we know it strikes a powerful blow and he turns chibi...that's about all. We'll probably get an explaination about it when he uses it next time.
I'm not quite sure on this myself, but because Luffy's entire body is rubber, why not his bones as well? If he can pump air into them to make them bigger to cover a wider area, then it makes sense that bites his thumb and forces air into the bone and then spreads it around as he needs to use it.
Hmm... I wonder why Luffy got the rubber devil fruit when the elemental fruits are supposed to be stronger... maybe there's a rumble ball demon inside him that's really strong... RUBBERZILLA!!!
You're forgetting that rubber is basically immune to any physical attacks as long as they aren't caused by a piercing effect or cutting effect like a sword, however he is very weak against Logia (elemental) type DF users (except Enel). This is interesting because Black Beard is immune to most elemental attacks with his dark dark fruit, but he isn't immune to physical attacks. It seems like they are the exact opposite of each other. This could become important later on.
Its not about the DF eaters wanting powers. it the powers that match them.
alvida thinks she's beautiful. so the df makes her really beautiful.
smoker smokes a lot so DF gives him smoke power.
Enel think he god so DF gives god like PAWAA!!
Buggy is a clown. so he gets circus powers. (ever seen the magic trick of cutting a lovely assistant in pieces?)
Hina is probably a dominatrix. DF gives caging powers.
pell is the falconman
the other guy is a Jackalman. both are avatars of the guardians of arabasta who happen to be Falcon and Jackal as well.
but Chopper may have wanted to be the same as other deers. so his DF played a trick on him and made him a human. but in the end his intelligence gained as a man made him more powerful.
DF are here to give inimaginable powers to those who eat them. so to be as powerful as possible, the powers need to match their users.
... only one i can't figure out is luffy. why rubber..?
That's simple, what happens when you stretch rubber? It just goes back into its original form. It never gives up, just like Luffy never gives up.
My thoughts exactly....how the f**k do you turn a gun or a sword into a living creature, let alone make it eat a fruit??
There is one special scientist that figured a lot out the devil fruits, how they work, and even how to put them into inanimate objects. I forgot the name of this scientist, but he is definitely going to be important later on.
I have a question. There was one time when Peru (Alabasta strongest soldier) fighting with Robin (i cant remember the chapter), and he was saying like "There are only 5 devil fruits like mine in this world." Does he mean 5 kinds of bird devil fruits or bird-hawk style fruit?
That was referring to the fact that there were only 5 flying type devil fruits. The ability to fly is probably incredibly useful because that allows you to stop yourself from falling into a pool of water.