This is a response to a challenge set by whitetigerwolf, the details of which can be found below:

Premise: While in a remote area, James and Lily Potter witness a strange crash and investigate. Within the craft they find a dead/dying alien life form and its child. They then adopt the child to raise as their own, using magic to disguise it as human.

Requirements:

The alien child Lily and James adopt CANNOT pass for a human naturally in appearance (this means there must be at least one detail that must be covered up. Example: the child is Vulcan, Lily and James use magic to make the ears APPEAR more rounded)

Harry is an Eldar in this story, their main feature being long pointed ears (when I say long I mean maybe one size smaller that a House Elf's)

The child must be Harry (If male) or FemHarry, in other words the Boy (girl if you do FemHarry)-Who-Lived

Harry is male in this story, just to keep things normal-ish

While Lily and James can have their own children, no wrong-boy-who-lived

Harry is an only child (James and Lily unwilling to try again after a failed attempt (note, this child would have been Harry))

While lily and James can blood adopt the alien (probably necessary to allow the child magic, unless it's from Star Wars or somewhere else with 'magic') the alien must remain primarily alien

Blood adoption is being used to hide Harry's ears and to allow him to do 'normal' magic in addition to those available to Eldar psykers

Harry (the alien child) cannot be in a m/m relationship

Happy to do this one, as I find it hard to read stories involving this (no offence, just a personal preference)

Lily and James must keep/be given something so that Harry knows his alien cultures heritage

Harry will be inheriting his mother's Soul Stone

Recommended:

Klingon Harry

Twi'lek Harry

Wookie Harry (Blood adoption may enable Harry to speak normally)

Tamaranean Harry

FemHarry

FemSlash

James and Lily survive Voldemort's attack

If James and Lily are killed, Harry placed under a long-term glamour that hides his inhuman nature until a certain age

Pretty much ignoring all above (other race, not wanting to try a FemHarry at the moment and sticking, mostly, to canon to begin with)

Harry's biological mother being pregnant when crashing and surviving under Lily and James' care long enough to teach the, her culture before giving birth and dying either during or shortly afterwards.

His mum will explain the purpose of the Soul Stone, which will be written down for Harry.

Disclaimer: The characters and world of Harry Potter belong to J. K. Rowling , and the Eldar and the 40k universe belong to Games Workshop. I am neither.

Chapter 1: Visitors

James sat still, staring into the fireplace in the home he and his wife had been hiding in, at the insistence of Albus Dumbledore, a matter of weeks ago, contemplating the events of the last week.

It was supposed to be a joyous occasion, he and Lily we're going to have a baby! Only that had been taken away from them, their little boy not surviving birth. They hadn't told anyone yet, they couldn't bring themselves to. Everyone in the Order had been excited about their baby, and Frank and Alice were looking forward to having a friend for their newborn as well. Neither he nor Lily could bring themselves to take that away from them, not yet.

Suddenly, James heard a low crackling from outside swiftly followed by a dull thud. Dashing to the door to the small backyard, he found Lily already pointing her wand out the open door at what appeared to be a strange, white rock the size of a muggle car. Slowly walking over to it with his wand drawn, he was shocked when a section of it suddenly disappeared and a figure stumbled out.

Before he had time to point his wand at the figure, it collapsed to the ground, protecting a bundle clutched to its chest as it landed. A short curse James couldn't understand met his ears as the figure, which he guessed was female from the sound of its voice, struggled to sit up. Stepping forward, James acted on an impulse.

"Excuse me? Are you ok there?"

The figures head shot up, a hood sliding back to reveal a young women with piercing blue eyes and an expression that reminded him of his old Transfiguration professor. Her scarlet hair hid most of her face, appearing to have fallen over it during her fall.

She slowly took in her surroundings, noticing him properly for the first time, and no doubt Lily as well. Seemingly satisfied, she looked back at him, her eyes briefly lighting up a pale blue before she spoke.

"I am sorry to have worried you. I did not have many choices of landing sites. My name is Shasaya, and you two would be James and Lily Potter, correct?"

"Yes we would." James spluttered. "How did you know? Did HE send you?"

James and Lily's wands, which had been relaxing at the lack of threats had suddenly jumped up to point at Shasaya again.

"No, HE did not. I am sorry, but I read your mind in order to learn your tongue in the little time I have left. I am here, not for my sake, I am already beyond saving be any of the means either of us has, but for me son. He was born only hours ago, and I would request you to look after him, physically, for me."

"I'm sorry we jumped to conclusions then." Lily replied softly, wand lowering again. "When you say look after your son physically, what exactly do you mean? And may we know his name?"

Shasaya seemed to smile at Lily's words, before bringing a little boy out from the blanket he was wrapper in.

"I say physically as I will soon pass on into my Spirit Stone when I die, and he will be able to talk to me in time so I may teach him." She replied, smiling down at her son. "And I have yet to name him. As I said, he is only a few hours old and for all intent and purpose he will no longer be mine." Looking up at Lily she gave a sad smile. "He will be raised as you son, and I will not be able to speak to him for many years. I would ask you to name him, should you take him. I only ask that he be able to appear human."

James saw her hair move as she looked back down at her son, and saw a pointed ear that reminded him strongly of a House-Elf's, and he could make out a similar pair on her child.

"You would trust you son to a pair of strangers you just met?" James asked softly, slowly walking over to Shasaya where Lily joined him.

"I have little choice. In a matter of minutes I will be dead, and he will need a home. And you forget: I saw your mind, both of yours. I know I can trust you with him." Shasaya gave a shuddering cough before fishing a dull purple and blue stone out of her pocket. Examining it a little closer, James saw dozens of what he assumed were runes littered across the surface of the stone. "My Soul Stone. I would like you to keep it till he turns five or six so he is able to talk to me."

Looking at Lily, James just knew that they would be taking the child in and adopting him as their own. Smiling at Lily he bent down next to Shasaya and gently placed his hands around the child.

"We would be honoured to look after you son. I promise you, we will do everything we can to give him a good life." He vowed.

"I must thank you for this. I will do my best to help you through my Soul Stone if I can, but I believe you will be on your own." She drew a sharp breath at some pain before hurriedly asking a final question. "What will you call him?"

"What we we're going to call our own son." Lily replied, joining James as they took the adopted child into their arms. "Harry James Potter."

Shasaya smiled at them, before briefly waving at the remains of her capsule causing it to suddenly disappear from view.

"A fine name. Good luck Harry Potter. May we talk again in better times."

Shasaya took a final look at the new family, before allowing her soul to pass into her Soul Stone, lighting it up with a pale glow, leaving her body to rapidly fade into nothingness, shocking both of the older Potters.

: A fine name indeed. :

The next morning saw James and Lily taking a trip into Diagon Alley. Lily to buy what they hadn't already prepared for, baby-wise, like food, diapers and appropriate clothing, while James ventured into Gringotts to officially adopt Harry. He also planned on under taking a blood adoption so that for all intents and purposes, Harry would appear to be his and Lily's natural son, and hopefully allow the child to perform magic as well.

Both the paper work for the adoption and the additional bits he had to file for the blood adoption were done in a matter of minutes, James labelling his friend Sirius Black as god-father, and putting down Alice Longbottom as god-mother by Lily's request.

The actual process for the blood adoption was also remarkably fast, the goblins using a pair of self-fitting bracelets imbued with goblin magic for the ritual itself. What both James and Lily had forgot to think of, and that became abundantly clear as the ritual was under way, was that blood adoption rituals were known to change the appearance of those being adopted to varying degrees. Harry's striking blue eyes slowly changed to mirror Lily's emerald ones, while his hair changed from the brilliant red into a shade of black similar to James, and much like James, immediately got out of control and stuck up absolutely everywhere.

Though he and Lily would later find Harry crawling around the house with his hair acting like multi coloured ink: rapidly changing from one colour to another. Whether it was something Harry and Shasaya were both able to do, or if either James or Lily had transferred the rare Metamorphmagus ability onto him they would never know.

Getting back to Godric's Hollow and setting Harry up in the cradle in his new room, James and Lily set about informing their friends and family of Harry's 'birth'.

"Hey Sirius! Guess what? Lily and I are parents!" James' words to his school friend got them both excited, Sirius appearing to bounce up and down in the Floo call. "And Lily and I agreed that you should be god-father." He said much more seriously, which made Sirius pause for several seconds before asking to come over immediately.

"Not yet, soon. We have to call a few other people, and then I plan on making Lily get some rest. It was a stressful day." While James didn't like lying to his friend, explaining the whole situation behind Harry's 'birth' would be too confusing, and James didn't want it to get out by accident. No, only he and Lily would know, and, in time, so would Harry.

"Alright Prongs, alright. I'll wait till tomorrow and come by sometime with Mooney and Wormtail. I'll let you call 'em before I gather them up and go out celebrating. And you won't regret making me god-father. I'll act mature and everything, at least until he's a little older and we get the Marauders together to teach him our ways." Sirius replied, suddenly going from almost over the top happy to dead calm for that last part.

"I know that Sirius, we both trust you to act serious in front of Harry." James replied smiling, closing the Floo call connection before Sirius was able to make his overused name pun.

The rest of the calls went in a similar manner, Alice staring at Lily for several minutes when she was told she was god-mother, Albus having a strange twinkle in his eye, despite the Floo using fire as a projective surface, while offering his congratulations and the Muggle phone call to Lily's sister ending in shouting and screaming from Petunia as was the norm.

Following all of their excitement for the day, both Lily and decided to turn in and deal with the visits from the few keyed into the Fidelius Charm the next day.

James and Lily were both worried. They had adopted Harry over a year ago now, and on his first birthday a few months ago, Dumbledore had decided to tell them that Voldemort was most likely actively hunting them or the Longbottom family in relation to a matter he couldn't discuss until such a time as it had been dealt with. Hence the entire Potter family entertaining itself on Halloween.

They found those worries well founded when they felt the Fidelius Charm and the other assorted wards protecting them from Voldemort and his Death Eaters collapsed in an instant and what were presumably anti-apparition and anti-portkey wards went up in their place.

Rushing to the front door with his wand drawn, James hoped that it was merely a group of Death Eaters. While dangerous, he knew he stood little to no chance against Voldemort himself. He was therefore distraught to discover Voldemort casually blowing apart the front door and striding in.

"Lily, it's him! I'll hold him off, just run!" James shouted to Lily, already putting his considerable Transfiguration skills to use creating a series of shields from furniture and pieces of the wall to place between himself and Voldemort.

"Such courage and false hope. You cannot stand in my path and live I'm afraid." Voldemort's surprisingly calm and refined voice drifted down the corridor to James mere moments before a burst of Fiendfyre turned his shields into ash, followed swiftly by, "Avada Kedavra."

With no time to react, the green jet of light sped down the corridor and killed James where he stood, his body falling to the floor.

Chuckling to himself, Voldemort slowly climbed to the second story where he could he the Muggle-born apparently barricading a door with furniture. Sighing to himself about the unnecessary work, he strode up to the door and blasted it open, before striding in and training his wand on the girl who stood between him and his goal.

"Stand aside, lest you wish to join your husband."

Voldemort could see the horror in her eyes as she heard that, though she seemed to steel herself before begging.

"Please, not Harry. Kill me but leave Harry to live."

"I'm afraid you stand between me and my goal. I will only offer you one last chance to step aside." Voldemort watched as she slowly turned back to the child, placing some kind of necklace on the child.

"I'm sorry Harry, remember that your parents love you." Turning back, Voldemort could see that see was refusing to move yet again.

"A pity, Severus asked me to spare you. Oh well. Avada Kedavra." Once again a green jet shot from his wand and once again his target fell to the floor dead. "And now, my dear child, I ensure my survival once again. Avada….Kedavra."

For a third and final time that night, the green jet of light that was conjured as the Killing Curse spend from him wand to his target. But instead of working as it had even moments ago, it suddenly disappeared mere inches from the child's skin. Frowning in confusion, Voldemort went to raise his wand to cast the spell on the child once more, noting the look if concentration on its face in passing, before a dome of energy suddenly exploded outwards, shredding his body and most of the house.

Being forced to assume a spirit form as his Horcruxs saved him from death, Voldemort fled the remains of the cottage, fearful that the child figure out he was still alive and attempt to end the prophecy much like he himself had mere moments ago.

Still sitting in his cradle, watching a cloud of smoke be blown away, Harry lay down to sleep, suddenly feeling tired. He would be woken again in a several hours in the arms of a huge man on a flying motorcycle only to fall asleep once more, later waking to his aunts screams outside of his new home in Surrey.