Can a child of a fiend be innocent?
The child of a fiend, assuming the Half-Fiend template, is still an evil outsider. Interesting question.
Here's another scenario for the "Kill all Evil Outsiders! Always! Immediately!" folks:
Sir Percival is a world-renowned demon slayer--he has been for many years. His parents were slain by demons, and he found his path when the God of Justice answered his prayers and offered him the Lawful and Holy might to defeat those Chaotic Evil outsiders and rid the land of their scourge. That is when Sir Percival became a Paladin.
He and his wife of ten years, a lady warrior named Anya, have slain demons together since they met, stopping dozens of major plots by various demon lords to exploit the powerful nexuses of axiomatic energy that are prevalent in Percival's homeland and make it a target--long ago, the demons began a sinister plan here, but great wardens of Law set up these nexuses. If the nexuses were tainted with chaos, the land would begin to melt, and it could be merged with the Abyss. With Percival's Holy Blade and Aegis Shield and Anya's Longsword, +1 Flaming Composite Longbow, and Magic Rope, they have entrusted their lives to one another and held off against the demons together.
Percival and Anya are deeply in love. Lately, they have been forced to scale back their assaults a bit because of the newest member of their family, their young daughter Erin, a cute, cheerful, and inquisitive young girl of 6. Cue the scene:
PERCIVAL: Time for bed sweetie
ERIN: Okay. I love you Daddy!
Erin gives Percival a big hug and heads off to bed, but Percival frowns. He calls out to the kitchen--
P: Honey?
Anya: Yes, my love?
P: Can you come here, please? There's something that's bothering me.
A: Of course, dear. I'm baking cookies. It
is Erin's birthday tomorrow after all. But shh, that's going to be a surprise
P: Right, right...but, look, I've never tried this intentionally because it just seemed paranoid, but the other day when I was walking to town with Erin, I saw a vagrant who looked like he might be evil and used Detect Evil. Well, the vagrant wasn't after all, but Erin gave off a Moderate aura of Evil. How is that even possible? I thought it might be local disturbances or something wrong with my powers, but I've tried it again and again, and I'm getting the same reading on my evil-dar.
Anya gives a deep and regretful sigh
A: I knew this day would come eventually, my love. It seems our perfect life is at an end.
P: What in the world do you...?
A: It would have become obvious sooner or later, when she hit adolescence and started growing wings. I'm just surprised she has 2 Hit Dice at the age of 6, maybe because she's advanced like me.
P: Wings? Okay honey, that's not funny.
Anya sighs again.
A: It's not a joke, my love. My real name isn't Anya. It's Anyiel. I'm an Erinyes--a Fallen Angel. Since time immemorial, it has been my task to protect those Axiomatic nexuses from demonic control, first when I served the hosts of Heaven, and now for my dark masters in Baator.
P: Okay, stop this. You're a woman of honour, so stop this lying. Are you trying to cover for something Erin did? I know you. You've never committed an evil act as long as we've been together.
A: No dear, I'm afraid I'm telling the truth. I fell from grace because I was willing to use any means necessary to protect the nexuses, and it required some dark means indeed, but I found that those in Hell approved of what I had done and offered me a new home with my old job back. But...I fell in love with the champion whose resolve to kill demons and protect the nexuses matched my own. A part of me envied you that you could do it and maintain your morals. I've been able to get away with not committing any evil deeds because I'm doing exactly as the dark masters demand...I knew I couldn't continue alone without you, for both practically for your mighty holy power and because of my smitten heart, so I didn't commit any evil acts because I know that it would then violate your code of conduct to associate with me.
P: It can't be...but you're not evil, you're my...
Anya bursts into hysterical tears and shouts:
A: If you don't believe me, look!
She uses Alternate Form to revert to her true form and rips off the tiny gold ring with the Celestial writing on it that she's worn for all this time and never removed.
A: There, now try to Detect Evil again without my ring!
Percival uses Detect Evil and finds an Overwhelming aura of Evil.
***P: Holy Erroneous Heironeous! You tricked the ability with that ring! You're...
Anyiel looks down at the floor, downcast and devastated.
A: I am. I know you can never associate with me again, so I'll just leave. But please, I want you to raise Erin here. She'll be persecuted enough for her strange features, but I think she can still keep the purity of heart and kindness of spirit that has been lost to me forever, if only she has a loving father who cares about her. If I took her back to Hell, she would become nothing more than another Devil...And please, I know you have to act with honour, but we still tell Erin about the tooth fairy, so you understand that sometimes comfortable little tales are important to help children live comfortable lives...
P: Actually, the tooth fairy is real. She's actually a Nixie named Lydentia. I met her once when the demons tried to invade the Faerie Woods.
A: Alright, but
anyway, could you just tell Erin that I died fighting a demon...At least she won't think as ill of me as you do and live knowing her mother is a monster. I will leave you now forever, my love. You won't see me ever again...
Tears of loss continue to stream down Anyiel's face as she turns her back to Percival, unable to face him any longer, and waits for his answer before she leaves. She thinks to herself--
A:
Though this loss hurts dearly, I should look on the bright side. At least I'll be able to perform evil acts again--that corrupt part of my soul has been killing me on the inside from all this holding in.
What does Percival do? I'll post below the list of possible choices I can think of, but you can pick your own!