I don't know so much about pixies and angels but spirits most definitely. I regularly see creatures not of this realm of existance from small shadowy things to more solid looking creatures that resemble small cats/dogs/other animals and some very strange looking gargoylish type of creatures. I've seen human looking spirits as well.

ive seen odinn, and those little dwergi thing that dance around him. so has my sister mum and dad. my mum and dad got to meet the mother goddes Dianna. but if you ask me leve odinn be.

My doggy I call him Fruity because he loves fruit right off the tree, he also picks it himself LOL

anyways he sees things too and then sometimes even barks at them, sometimes I can feel the spirit in the room he sees but not see it my self, so yes he is a keeper *giggle*