[Luvian]

Nightcrawler is really Mystique's son. We saw all that in the storyline when they talk about his past.

Mistique was living as a noble lady, and was maried to a eastern europe nobleman. They had a child, and he was blue, so she gave the child to a monk monastery and ran away. That's why he is so religious, he was raised by them in secret until the vilagers burned down the monastery to get to the "demon" that was in it, and he was forced to run away.