Kerbal

Kerbals, as they appear in Kerbal Space Program.

Kerbals are a race of small green humanoids who are native to the planet Kerbin, serving as a in-game analogs for humans in Kerbal Space Program.

Features

The Kerbals are basically humans, just with green skin and strange vocal patterns. Kerbals can be pilots or occupants of spacecraft/planes, and show a mathematical prowess, being able to calculate and analyze scientific data. They also have a Courage and Stupidity bar, which, besides changing their facial expressions during flight, appear to do nothing. The three most well-known Kerbals are Bill, Jebidiah, Bob, and Valentina Kerman. It also seems that most of the Kerbian names are 2 words: a common name + a noun. For example, Johnhat Kerman. Also, all Kerbals have the last name Kerman, which will 

The Kerbal Courage and Stupidity bars.

possibly be changed in a future update.  

 It is quite obvious that the kerbal design is based off of the stereotypical martian, excluding the eyes and square head.  Kerbals also seem to be able to bounce off of almost any surface without dying. 

Similarities to Martians:

Strange vocal patterns

Green Skin

Strange abilities (no blunt force trauma)

Strange shaped head

Similarites to Humans

The kerbals seem to have an average level of intelligance

Humanoid

Bipedal

Hair

Two Eyes

Social Contact

Ability to drown

Breathes oxygen