I love stories about "Ben 10's" necrifriggian babies without male-slash pairing. And even thought up something about an Omnetrix wielding Harry Potter when he as Big Chill lay eggs, for those who're writing "Harry Potter/Ben 10" crossovers.
In my theory, necrofriggian is a gender-less race, so because Harry is magical, his alien-children can at will turn to gender-bending humans that look just like their parent, despite gender. Also that they are possessing ice-breathing and ghost-like abilities in both alien and human forms and they are dressed in a blue hooded rain-poncho based on their folded wings/robes and antennas/hoods.