Fighters are known, in the sword and sorcery multiverse, as hardened warriors, with more mobility and less hardheadedness then a Knight, making up any minute shift in strength for a wide gain in dexterity. Rangers live by the phrase, "know your environment" and may even prefer the wild outdoors to civilization; some have even been said to have taken the shape of "spirit animals" or "totems". Elves, by that same tolkein, are said to possess a brilliant tactitional mind in a body whose humanoid shape responds with a grace beyond the grip of all but the most hardened human warriors. This lethal combination enjoys sneaking, fighting, killing monsters, camping, fishing, and horsies.
Green is a color symbolic of the elements of earth and wood; those that make up the living base that everything else thrives upon. It would most commonly be used by Wood or Earth elves; or anyone trying to blend into a woodlands backdrop. It generally will do well in most climates.
True to his ecological nature, our friend here is wearing an outfit made entirely of 100% recycled yarn.