She is a thief, dawnguard, dragonborn and soon to be Stormcloak.
1 reason why I want to adopt is because I need the RED ROBES.
I assume your character is not a Thalmor then? Reading your characters story, she seems very open minded. So she's most likely open to the idea of adopting a human child. Or maybe she just pities the child, like Lucia.
To maximize the feeling of height superiority.
I once was rp'ing as an evil Dunmer mage and I adopted Lucia and that kid that runs errands in Dawnstar I think. Not because I pitied them but because, my character took them on as apprentices. Plus secretly he put a bound soul spell on them. So if he ever got killed, he can take over their little bodies.
I was thinking earlier that I wish they had a few non-humanoid children running around, like say they could have an Argonian child working on the docks in Windhelm or a little Khajiit that one of the caravans picked up in their travels. Maybe a few Dunmer children in the Dragonborn DLC. That way each race, if the player wanted to, could adopt a child like their particular character
Seeing as how she doesn't agree with the Thalmor ( because she's joining the Stormcloaks ) why not Rp it that she feels as though she needs to atone for the crimes of her fellow Altmer. How many of the orphans are orphans because of the civil war anyway? Anyway you could Rp that she feels as though in order to atone for her kind she must take it upon herself to raise the child, teach the child that not all Altmer are monsters, not all Altmer want to kill her kind.
I'm not sure on either of their back stories but you could Rp that they where orphaned due to the war, thus you feel that it's your responsibility to atone for it.
Could be something like during a battle one of your fellow Stormcloaks fell, with his last breath he mentioned his daughter. Made you feel the need to give her a home?
You have had a character visit Rorickstead and talked to the Altmer Residents? An Altmer adopting a Human may be seen as practice for the job of being a proper Mother in a few hundred Years, practice makes perfect.
You could also pretend that the child you want to adopt is also a vagrant. Fits perfectly with your roleplay.
She wants to raise an inferior Nord to grow up in the light of Auri-El and become a superior being than his/her savage misguided ancestors. She feels pity for the Nord's primitve practices that promote instinctual and animalistic life-styles and desires. As such she takes the burden of saving a nord child to become something better. So that the child can become a paragon of the depraved Nordic race.
But your Altmer supports Nord anti-Mer Xenophobes so, meh. Maybe she just likes kids?
not all characters have the same beliefs and mindsets just because they share a race..
like in Oblivion, there was a Mages guild member who was a Redguard who basically says "yeah i know, not many Redguard mages, well im different.. okay?"
one of the members of the legion on Skyrim is an Altmer, but as a member of the Legion she is fighting to defend Humanity, as well as focusing on Might rather then Magic.
we even see Orcs that follow the Code of Chivalry (Mazoga), instead of the tribal mindset most have
or in some cases, Orcs that follow an Academic route (the one in Skyrim who runs the Colleges library, as well as the Orc that ran the book shop in Leyawiin during Oblivion)
etc.
we see throughout the entire franchise Citizens who don't believe and don't have the same mindset as others who share their race...
if anything saying "ohh,
To Sum it up:
In turn, your character would adopt a human child because she wants to.. that simple.
Lucky for me the Orc child mod works, but still needs a little work!
Im surprised they didnt have at least one child of every race. My dunmer feels very weird with human children.
My Dunmer married a Nord and they adopted a Breton. I don't see anything strange about it.