Harry's Species

An unnamed species of sapient humanoids. Only one individual has been encountered so far.

Biology
This species are a polychromatic skinned humanoid species. Their characteristics though include possessing pointed ears and eyes with dual pupils. Additionally they have a total of four digits on each of their hands. They have similar genders of male and female comparable to Humans. Females are noted to sport long manes of hair while males have bald scalps, though a few do sport some facial hair. It is believed that they can see into different spectrum of like such as infrared.

The species appears to have an innate ability to comprehend information at a fast pace, outstripping Humans. They are able to have keen observant abilities, able to read Human emotions better as they can detect micromovements of muscle and nerve changes that Humans to them are transparent and able to see through lies. That added with the mental powers that the species possess they can create a psychic image of themselves to cast an illusion to appear Human. Though the ability does have weaknesses as one in a million Humans are immune to this. Their true forms can be perceived through other visual mediums such as videos and cameras though the species developed technology to disrupt and interfere with the former.

Culture and society
The species are a peaceful spacefaring race. Due to their psychic nature, they seem to be comfortable in exchanging information via thoughts, even possessing couriers with the specific job to pass thought messages.

Resident Alien (TV series)
These aliens are between 7-8 ft tall (~ 2.1 - 2.4 meters). They are also bipedal and extremely strong, able to throw an adult Human through a wall.

Their skin is blue/purple in coloration and has the ability to shape-shift into different forms.

They have two legs, two primary arms with four fingers each, and a smaller pair of abdominal arms

Alcohol has the same effect on them as it has on Humans, hinting at a similar body chemistry.

On one occasion, a member of the species pointed to their star system of origin which is in the constellation Ursa Major and is in fact, the binary system Mizar/Alcol.

They seem to have very specific opinions about other species. They consider Greys to be Insidious assholes, Arcturians are jerks, Little Green Men are "quite cute, and they so, know it", Not much is said about the Insectoids other than that one of them owes one of two known members of the species money, they find the Blue Avians to be quite nice. Not much is said about the Anunnaki but from the facial expression given by this species one of the species' only known members, they seem to be quite afraid of them due to their ability to transmogrify matter.

It was stated by a member of the species that aliens built Stone Henge, but it is not conformed if it was them, but it's best we assume it was them.