A superior species to the townie
Named after this theory, matching their psychological makeup
G = Genuine
R = Respectful
E = Educated
B = Befriending
Grebs enjoy a highly comunistical society all are equals, status is gained by friendlyness or individuality rather than random muggings. Most grebs will stay with a sexual partner for years, seeing the bond of friendship to be more than just the sex.
There have been extreme circumstances where grebs have been forced into agressive reactions towards townies, but these are easily won due to more muscular mass in case of males, and increased mental capacity in females.
In greb circles it is cool to express yourself, it is uncommon for a group of grebs to have not formed a band at some point. Most have excellent art or design skills, but would rather have fun producing random films.