Half Demon:
Stone: he honestly wouldn't care. He has been dealing with Pebble for years, so he is used to it. He would treat you the same.
Vinnie: she would be a bit surprised, but didn't really care much. She would use it to her advantage when stealing tho
Skipp: he would be so surprised, but then he would begin asking many questions, such as, "Who was the demon, your mom or your dad?" "How is that possible?" "Does it hurt?" Stuff like that
Ditch: he would be surprised, but he would mainly asked why you kept it from him for a while. He would care that your not fully human, he just wants to know if you trust him, and asks you what to change about himself to help you trust him more
Pebble: he would be stoked. He himself is a candy acid trip demon, so it would be cool to have someone around that was kinda like him, if only slightly.
Half Angel:
Stone: the first thing he would ask is if you know Maggot. If you say yes, he'll ask you to say hi to him for him. But if not, he just shrugs and goes about his day as if you haven't told a very important fact about your life.
Vinnie: she would be in awe. She would ask you questions, and it would be like she was a little kid again.
Skipp: he would immediately bow down to you. He tries to make you more comfortable and treats you like the god/goddess that you are.
Ditch: he would just do the same thing on the Half Demon headcanons
Pebble: he would be a little surprised, not expecting it. Your an angel, he's a demon. He would immediately compare it to anime with the same premise, an angel and a demon as friends.