promethean body.

do their bodies changed? like if they work out they get muscle, finger nail and hair growth?

Yes. Prometheans are living beings made from dead bodies, as opposed to vampires, who are biologically dead but still walk and talk.

Actually I don't think that they do change, though this isn't addressed.

I go on a case by case with each promethan.  Most of the times I consider them like dolls and they're pretty much can grow what they started off back but they don't grow more hair or more nails then they started with.  Then again, I tend to judge this on a case by case.  I don't know if their is an actual rule

Chaka:

Yes. Prometheans are living beings made from dead bodies, as opposed to vampires, who are biologically dead but still walk and talk.

I agree completely

Prometheans are by definition different than the living bodies they were made from.  If made from a single body the body is still changed by the death and then rebuilding process.  Some are actually made from multiple corpses and have even less similarities to their donor(s) of course.

Chaka:

Yes. Prometheans are living beings made from dead bodies, as opposed to vampires, who are biologically dead but still walk and talk.

Disagreement.    Prometheans are constructs, not living bodies, powered by the Divine Fire.   Prometheans don't build up lactic acids and toxins in their body from working, they don't digest food (it directly feeds the Azoth, and thus produces no waste products) and have no need of drinking water (ever).   Prometheans do not age, so long as they occasionally head to the wastes or ressurect. 

Promethean the Created, p161:

Yet it is only the energy of this undying flame that animates the dead flesh of a  Promethean’s body. As such, Prometheans aren’t really “alive,” the way human beings understand the term. The Azoth that animates them and keeps them going doesn’t spark the same organic processes that human beings call life, nor is it subject to the same circadian rhythms that human bodies maintain.

Prometheans are just as biologically dead as the vampire.

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Blunt Vorpal:

Chaka:

Yes. Prometheans are living beings made from dead bodies, as opposed to vampires, who are biologically dead but still walk and talk.

Disagreement.    Prometheans are constructs, not living bodies, powered by the Divine Fire.   Prometheans don't build up lactic acids and toxins in their body from working, they don't digest food (it directly feeds the Azoth, and thus produces no waste products) and have no need of drinking water (ever).   Prometheans do not age, so long as they occasionally head to the wastes or ressurect. 

Promethean the Created, p161:

Yet it is only the energy of this undying flame that animates the dead flesh of a  Promethean’s body. As such, Prometheans aren’t really “alive,” the way human beings understand the term. The Azoth that animates them and keeps them going doesn’t spark the same organic processes that human beings call life, nor is it subject to the same circadian rhythms that human bodies maintain.

Prometheans are just as biologically dead as the vampire.

I retract my previous statement and say that this one is more true. =/

Prometheans can certainly increase their Strength (as can anyone, even vampires), and the writers have been rather hasty to point out that they're not undead per se (particularly that Life, not Death, affectsthem), but... they live a half-life. They're not fully living beings. Close medical examination would give the jig up, and they're superhuman in several ways. Honestly, though, I'd just go with the rule of cool. If it seems right, do it. Pyros is (probably, maybe) the element of change, after all.

Crabbadon:

the writers have been rather hasty to point out that they're not undead per se (particularly that Life, not Death, affects them),

Sort of.   The writers have given their opinion on what they would do; I've never once seen a rule in a book, nor one of them outright say, that Prometheans are definitely not undead.    They want to leave the option open.    There's plenty of stories in pop culture that assume that Frankenstein creations are truly alive, and others that consider them undead creatures on the level of zombies, vampires, and wraiths.

EDIT:   Besides, even if Prometheans aren't undead, I'd argue that they still should need a Death 2 conjunctional in order to be targeted by life magics.   Death is the arcana of spiritual transformations.   The Azoth inside a Promethean is carrying out a spiritual transformation on his body, from dead matter to living flesh.   The transformation aspect alone should be enough to justify the use of Death 2 + Life X.

I'm not a mage expert by any stretch, but I know promethan, and they are constructs, not unlike golems.  Undead's usually have the souls of their past owners trapped inside of them to animate them.  Promethans sorta are in the middle of that, seeing you can animate a promethan out of metal, or make a promethan with something other then dead flesh, it just happens that most of them are rebuilt from human bodies.  They are more like inanimate objects given life, I think that mages would use whatever would disassemble an inanimate object, seeing I don't know if the death sphere does that I really can't make any claims that I know.

Quick question, though - do Prometheans have souls? (And I don't mean for this to stray away from the main subject of this topic)

They have something akin to a soul. Its essentially what they are working on.

If souls were flies, Prometheans would have maggots.

Pleasant image, I know.

On the topic of biology, I do completely agree with Dizzy, though. But now if they're just as biologically dead as vampires, do Prometheans not breathe as well?

Or do they simulate breathing?

What about a robotic/machine promethean? Or a half machine half biological construct. Is that possible?

If you ask me, an AI or robot powered by magic would probably be more relatable in a modern tale than imitating the Frankenstein monster.