Yes, Vivo Y83 does have the e-compass.
Yes, Vivo Y83 does have the AI Face Beauty which detects gender, age, skin tone, skin texture and lighting environment and applies the necessary corrections on your selfies. You also have the option to in-active it.
Yes, Vivo Y83 is a true 4G VoLTE phone.
No. Vivo Y83 does not have the fast charging support.