Grey-skinned humanoids, usually 3–4 feet tall, bald, with black almond-shaped eyes, nostrils without a nose, slits for mouths, no ears and 3-4 fingers including thumb. They have been the centre of quite a few cases of alleged alien contact over the years, most recent case was by J.F he recounted being abducted on multiple occasions were he was subjected to an obscene amount of rectum probes.
Diminutive green humanoids. Even though a few abduction or anal probe cases have referred to green skin no report has ever involved anything that would fit the classic cultural stereotype of "Little Green Men". They are included here only for cultural reference.
Humanoids with stereotypical "Nordic features" (tall, blond hair, blue eyes) and have featured in several cases of contact. It is said they are from Ancient Earth but presented themselves as ET's in the past, they moved from living in the surface to live underground around the Himalayas area after a natural event. 
^Bryan, C.D.B (1995). Close Encounters of the Fourth Kind. Alfred A. Knopf, Inc. ISBN9780679429753.
^ abBlackmore, Susan (May 1998). "Abduction by Aliens or Sleep Paralysis?". Skeptical Inquirer. Amherst, NY, 14226, US: Committee for Skeptical Inquiry. 22 (3). ISSN0194-6730. OCLC4081591. Archived from the original on 2010-08-13. Retrieved 2015-06-02. The '[G]ray' is about four feet high, with a slender body and neck, a large head, and huge, black, slanted, almond-shaped eyes. Grays usually have no hair and often only three fingers on each hand.