Nomads, vagabonds, drifters, explorers, wildmen, beast talkers. Clan gangrel is known as the clan that wanders and generally has an affinity for nature. Unlike some of the other clans there's little that I can say here to help paint a picture that isn't said elsewhere. The clan does have its particular embracing practices, as well as (despite stereotypes the contrary) its own version of organizations. Such things are detailed in the page linked above.
Additional Attribute dot upon Embrace
Stamina or Wits
Clan Disciplines
Animalism
Fortitude
Protean
Clan Weakness
Clan gangrel has always been closer to the beasts of the wild than to either the children of Seth or the children of Caine. This displays in the Gangrels weakness. Anytime a gangrel frenzies she develops an animal trait, this trait can be physical or mental. When she frenzies next she developes a new trait, though traits past the first can be willed away with a Vitae and a Willpower, however as the Gangrel gets older it gets more and more physically and mentally taxing to remove these traits, leading to some elders looking more beast than man.
Political Affiliations
Anarch Gangrel
There are some, but its predominantly young Gangrel used to more modern political structures. Many leave as they get older.
Camarilla Gangrel
Most gangrel are nominally in the Camarilla, just enough to pay lip service to avoid trouble. A Cam gangrel who is truly a believer to the core is a rare thing, though some to accept positions like Sheriff, Hound, or Scourge in exchange for payment.
Independant Gangrel
Many gangrel are nominally independent, but very few will go out and shout it from the rooftops. Better to just nod the head to the venture and avoid the hassle.
Sabbat Gangrel
Sabbat gangrel are almost always from those embraced within the sect, very few gangrel go and join the sabbat after the embrace. For whatever it's worth this means that most Sabbat Gangrel (or country gangrel as they call them) could have their lineages traced back to the original revolt, if they cared to. Many sabbat gangrel revel in getting to be a beast and hunter, and the Path of the Feral Heart is quite common among the clan. There is a stereotype of sabbat gangrel being vagabonds though, and on many occasions where a Sabbat Gangrels pack has been wiped out he's simply left the sect to go independent and live a nomad life.