Arne: twitter, website
Arne has inspired every aspect of my art, and I've learned most of what I know either directly from him, or via some post of his. His work is cute and gentle on the eye.
Indigo: twitter, website
Dan is more specifically my favourite pixel artist ever. I can tell by the pixel art that is out there today that may people were inspired by Indigo either directly or through others. The way he thinks about and approaches pixel art is what I believe has shaped the medium as it is today and separated it from the works of old.
There are definitely many more who I could consider favourites, but these two I feel deserve special mention because of how greatly they have influenced me and my art.