New Fic Idea, No Name yet.

[Lenneth]

Um, at this point, wouldn't it be better to use Emeralda from Xenogears for this? She's a technorganic being, unlike KOS MOS, which makes the transition in a cursed spring a lot less messy and a lot more believable.

Nope, Emerelda is a nanomachine colony, so it wouldn't work right, and technically that would be much more messy.
(I'm not 100% certain but I think Xenosaga Reallians[SP?] are the same)

And for the record, Xenosaga has officially been split off from Xenogears's storyline, so any and all things they may have had in common have been retconned by Namco...

Nope, Still a lot in common with and numerous connections between the two if you know where to look.
And FYI Namco was only the Publisher, they had no say in the content, the Xenosaga sires was "Developed" by Monolith not Namco.

[GenocideHeart]

You DO know what a retcon is, right?
Regarding Emeralda, she's not a nanomachine colony. She's a biotechnological construct based on nanites. Big difference, as it means she's part organic. Remember, Kim and Elly made her with THEIR genetic code. She's pretty much their daughter from a biological POV. The nanites just allow her to decompose and reassemble herself, as well as alter her structure, but the organic part is still there.
So yes, it'd be considerably LESS messy to use her, since unlike KOS MOS, all her abilities are enabled by her nanites, and if Emeralda somehow created a spring, it'd make sense for some of her nanites to have been left over there.
Seeing how she lasted 1,200 or so years in Zeboim without them running out of energy, and seeing how Jusenkyou looks like it'd be full of 'ether' (assuming that is even what powers her up, which I doubt - she was still active when the other Gears shut down, BTW, which is proof she either has a different power sources or is more organic than nanomachine - she'd otherwise have died on the spot), having a 'spring of drowned Emeralda' is very, very feasible, and could account for a Ranma with actual nanomachines inside him.
Meanwhile, KOS MOS is for the vast majority an artificial being, so she'll cause messy things when you take into account Third Armament.
And finally, the nanomachines would actually make the transition from normal to cursed less traumatic than being full machine or anything like it. Remember, nanites replicate themselves, and even after ranma reverts, teh ones that were replicated won't disappear, as they aren't Jusenkyo-made, so he'd eventually be a biotechnological lifeform regardless of if he's in cursed form or not.

[Lenneth]

You DO know what a retcon is, right?

Yes

Regarding Emeralda, she's not a nanomachine colony. She's a biotechnological construct based on nanites. Big difference, as it means she's part organic. Remember, Kim and Elly made her with THEIR genetic code. She's pretty much their daughter from a biological POV. The nanites just allow her to decompose and reassemble herself, as well as alter her structure, but the organic part is still there.

I think you had better play Xenogears again, it specifically states that Emerelda was a Nanomachine Colony.

Meanwhile, KOS MOS is for the vast majority an artificial being, so she'll cause messy things when you take into account Third Armament.

It wont be a problem the way I am doing things.
(Not going to Explain, to many spoilers;))

[GenocideHeart]

I think you had better play Xenogears again, it specifically states that Emerelda was a Nanomachine Colony.

It also specifically states, in the Zeboim flashbacks, that she possessed part of the genetic code of both Kim and Elly. That can NOT be done, unless she's at least partly organic, and a simple nanomacine colony isn't organic, hence Emmy has to be a technorganic construct, although nanites ARE her base.
That, or a plothole, pick your poison.

[Climhazard]

It also specifically states, in the Zeboim flashbacks, that she possessed part of the genetic code of both Kim and Elly.

I don't remember anything about genetic code in Emeralda... How i remeber it, Kim just create her like a substitute child for him and Elly, because their own DNA pretty much screwed up and they can have children at all... So what the point in placed badly damaged DNA in Emeralda?
But of course, mt memories about Zeboim pretty hazy...

[bissek]

Emeralda was created because a sizable fraction of the local population had a genetic disorder that made it impossible for them to have children (including the Elly of that era). I think the nanomachine colony inside her was designed so that she could either repair the gene disorder in the local population (If she was intended to be one of a kind) or filter out the gene sequence that carried this disorder in her own children(if she was the prototype of a series of creations that never got built, due to military interference), so that their culture wouldn't die out. In the second possibility, she would have been designed to be capable of at least emulating DNA to the point where she could interbreed with a human.
Regardless, Emeralda is a sapient life form, while KOS-MOS is a machine programmed to simulate a sapient lifeform. The only times KOS-MOS truly qualifies as a person rather than a thing is when her eyes turn blue for no apparent reason (I don't have ep 3 yet - that may explain the cause of eye color change and personality acquisition).

[GenocideHeart]

Actually, it wasn't the DNA that was damaged per se... it was specifically the population's ability to procreate. If I recall, the pollution caused by war made the entirety of the population infertile, to the point that not even artificial insemination worked.
Hence why she was created - to give mankind a new future. There were supposed to be others, but the military interfered, so the 'new human race' was never made.
The nanomachines were to keep her from being hit by the pollution, which was probably radioactive in nature. But she was organic enough to procreate, if I recall the Zeboim scenes wih her correctly.
So no, Emeralda is not just nanomachines.
Oh well. Your fic, your choice. Personally, I predict a disastrous cross as issues come up, but I give you props for actually wanting to try... at least i's somewhat original, even though the fics starring KOS MOS are becoming a dime a dozen lately.

[Lenneth]

Ahem!
The most extensive part discussing Emereda.
(Approx 3/4 the way down)
Contains spoiler's to the game but I will quote it anyway since it's such an old game
(Emphasis Added)

[Scene opens in the passageway behind Billy who's at the far door looking back at the one they entered. The green glass of the door tints him. He turns around to face camera. Camera pan back and to the left into a circular chamber. A sound is heard. Something begins to rise out of a circular section in the center of the floor. Scene cut to shot of the room from the door. as a large green tube is lifted into the room and docked. Camera pan in closer to the tube. Static is heard as a shadow appears in the tube. The shadow flashes into a girl with green hair that is floating up from the tube current. She appears to be only a few years in age from sight. Inside the tube, she is nude. Scene fade.]
[Scene opens in the red tinted passageway. Camera above Billy on the side as he looks on. Citan walks in from the entrance door at the far end while Elly stands in the doorway. Citan stops a few feet in.]
CITAN
"What the..."
[The three regroup and enter the chamber. They circle the tube. Fade music. Camera pan to the right and down towards the floor. Camera rotate and pan to the back side behind Elly on the left side. Billy stands on the right, Citan on the left from camera. Billy puts his hands over his eyebrows, adjusting to the tube's brightness.]
BILLY
"Citan... This girl...?
How did she suddenly change into human form...?"
CITAN
"This girl appears to be an artificial lifeform created inside the reactor.
She was probably assembled in the reactor by using that series in the database in the control room...
Her body is most likely..."
STONE
"... Constructed from autonomic machines on a molecular scale...
In other words, a colony of nanomachines."
[The three turn to the door.]
[Begin music: "Jaws of Ice"]
[Scene cut to the door from behind Citan. The door opens. Two purple-uniformed Etones walk in and flank Elly and Billy, followed by two green-uniformed Etones. Stone is behind them and walks up to directly across the tube from Citan, in front of the green Etones.]
STONE
"I'll be taking that nanomachine colony with me, thank you...
That is the existence, or key -factor-, which god will guide us by to free humanity from its yoke."
[Stone turns to his left, forwards and then to his right.]
STONE
"So, if you don't mind..."
[Stone turns back to Citan. The purple Etones walk off the screen on both sides. A rumble is heard as the tubing begins to disappear into the ceiling. Camera begin to pan up from the group and keep panning to the ceiling where the tubing stops moving. Pan very slowly.]
BILLY
"Bishop..."
STONE
"Ah, Brother Billy. You're here too. This makes matters simple.
I know you'll understand... This nanomachine colony needs to be in the hands of an honorable person.
It's destined to be the 'salvation of humanity'."
BILLY
"An honorable person? I certainly do not think you are honorable anymore.
Eliminating the 'Ethos' and any surface-dwelling humans who don't agree with your own will..."
STONE
"What is the problem with eliminating those people not fit for 'salvation'?
Why, isn't our very faith based on the precept that 'only the chosen will be saved'?"
BILLY
"... There is something very wrong with that.
Salvation by faith is something that everyone should have an equal opportunity at attaining."
[Scene cut to behind Billy. The girl, now free from the tubing, stands bare in the center of the room.]
STONE
"Are you saying that you can save all of humankind?
If Krelian uses the nanomachine colony, at least we can save some chosen people.
But you don't understand how to utilize this. You can't save anyone.
Are you willing to take the responsibility for the loss you will cause humankind?"
[The Etone on the side of the room behind Elly walks to the girl and takes her out of the tubing to face him.]
BILLY
"..."
STONE
"My job now is to bring this nanomachine colony back to Krelian.
You see, unlike the 'Ethos', our aim is not the ancient weapons that lay in the city ruins.
I don't think we conflict with your interests."

You were saying?
Edit to Add this part
Link (Near the end of the Page)

[Scene opens in the orb chamber again. Krelian stands in the foreground facing the rotating orb faces. Camera behind Krelian.]
ORB FACES
You're back...? Well, find anything?
KRELIAN
"Yes. I have obtained a colony of nanomachines."
ORB FACES
How unsound.
In any case, is the M Project proceeding as planned? We need superior bodies and servants.
We've spent far too much time here.
We can't afford to mistake the ultimate destination of this new civilization.
They exist because of their 'mother'.
KRELIAN
"Hmm.
You've betrayed your 'mother', your 'creator',
just to sustain your own egos. You have no right to speak so..."
ORB FACES
That was... foolish, that was the past.
When we were trapped in that cursed flesh... But now, it is different.
KRELIAN
"I'll take no orders from you.
You have lost that flesh long ago, and now reside in the SOL-9000 as data.
Did you forget who revived you in there?
What may be an eternity to man is but a moment to a god.
I have no need for hesitation."
[Scene fade slow.]

And more here
Link
(3/4 Down)

[Scene opens in the circular chamber at the bottom of the Zeboim ruins (see Chapter 34). Kim and Elly stand in front of the test tube Emeralda at the bottom of the chamber. Kim is wearing a lab coat. Camera pan down to Kim's side as he examines Emeralda.]
KIM
"This, this is the new spirit vessel that will break the curse."
[Kim pauses.]
KIM
"It hasn't awakened yet.
The form was created by nanomachines, but neural simulation hasn't been done by the Assembler Tower yet.
It's physically stable, but still doesn't function as a living creature yet."
ELLY
"A nanomachine colony..."
[Scene cut to above and behind Kim.]
KIM
"No matter how many times we rewrite the heredity codes...
... the impressions embedded in our bodies cannot be stopped.
It was necessary to pursue this further. We had to recreate the molecular... no...
... actually the atomic level, by referring to the structural patterns of you and I."
[Kim continues.]
KIM
"This child... holds our futures and possibilities..."
ELLY
"Can this child be the angel who can give us more time?"
[Camera pan back and away slowly. Scene change.]
[Scene opens on the floor of the lobby area, present day. Fade music. Pan back to behind Fei and Emeralda looking out at the desolate remains of the lobby.]
EMERALDA
"... I, remember...
long ago... you...... Kim,... died...
right before town died... It was because soldiers of town... tried use me..."
FEI
"... That's right...
The memory in my soul... It was left in me for your sake..."
EMERALDA
"While I being held... Krelian told that I...
... the ultimate 'work of art' that technology gave birth to...
Yes, I knew I was thing. Look, my body...
Different from Maria, Margie... and Elly. ... Human imitation...... but different.
Kim and Elly said... I was angel..."

Still think I'm Wrong?

[GenocideHeart]

Yes, yes, I see all the references.
I also still recall the references to Emeralda having human DNA during the Zeboim flashbacks.
Sooo... which one of them is correct?
Seriously, if the game says she has human DNA, then it stands to reason she's at least partly organic. Machines, even nanites, DON'T have DNA at all.
But never mind...

[Climhazard]

The only times KOS-MOS truly qualifies as a person rather than a thing is when her eyes turn blue for no apparent reason (I don't have ep 3 yet - that may explain the cause of eye color change and personality acquisition).

I also don't see ep 3, but the whole "blue eye" thing IMO is Nephilim doing.

[Lenneth]

GenocideHeart: Check the added Quotes.
the only thing even similar to what you say is this part.

KIM
"It hasn't awakened yet.
The form was created by nanomachines, but neural simulation hasn't been done by the Assembler Tower yet.
It's physically stable, but still doesn't function as a living creature yet."
ELLY
"A nanomachine colony..."
[Scene cut to above and behind Kim.]
KIM
"No matter how many times we rewrite the heredity codes...
... the impressions embedded in our bodies cannot be stopped.
It was necessary to pursue this further. We had to recreate the molecular... no...
... actually the atomic level, by referring to the structural patterns of you and I."

No mention of Human DNA, only of "Using the structural patterns of Kim and Elly as a blueprint for the Nanomachines to create an Artificial Life Form from the Atomic level up.
Not going to post Spoilers, but the Blue Eye thing has little if anything to do with Nephilim.

[Pale Wolf]

Seriously, if the game says she has human DNA, then it stands to reason she's at least partly organic. Machines, even nanites, DON'T have DNA at all.

Technically it's possible. If the nanomachines were on the small scale of replacing her cellular structure, they could use DNA to give themselves an overarcing physical structure in the same way that carbon cells do.

The form was created by nanomachines

By. Not 'of', nor 'out of'. Created 'by' nanomachines just means she wasn't born in a biological manner but was constructed by nanomachines.
That simple word choice means that nothing is proved by the quote that you took the time to put in bold.

[Lenneth]

Ugh, I give up, i'm just going to write the fic and see what happens from there...

[Lenneth]

I am still working on this Idea by the way and getting near the point of being able to post some of it in C&C.

[FOG3]

I'm thinking, why Ranma?
You're going to have to do a lot of tinkering to hammer him in there so you should have a good reason to use him over say, Ominae Yu. Ominae has a similar attitude to fanon Ranma, basically the same fight skills (if not better) refined to a more real world nature plus serious weapon skills, and has described himself as a immortal man in his manga before. You lose the curse, but Ominae won't give you any real baggage in the far future as Arcams job was basically to seal off the Ancient Super Tech, which tends to imply it'd remove itself from the picture eventually.
He is from Spriggan, which you should watch if you haven't as it's almost the pinnacle of the high budget Anime action movie.