The Traveler

All things considered, The Traveler is somewhat odd when compared to the other minor deities and demigods. For many, The Traveler is the embodiment of "freedom", and some consider him to be a benevolent counterpart to She Who Watches. In a way, both deities represent the idea of "freedom", and so there is a degree of nuance that can be hard to explain properly, as an individual more "feels" the influence of either god rather than "knows" it. The freedom provided by the worship of She Who Watches is focused inward, a freedom from morality, from one's conscience, and from the concept of the taboo. The Traveler on the other hand is a more outward kind of freedom: The freedom to explore, to wander, to not be tied down to a single culture or ancestry or mindset. 
The Traveler does not really follow any rules or adhere to any restrictions, but unlike She Who Watches, this is not out of a disdain for those who do or a desire to act without the "restrictions" of morality. Rather, The Traveler's teachings are more of the mindset that "if ignoring a rule has no negative impact, then it need not be adhered to simply because it is a rule". Perhaps the difference between the two deities is most emblematic in where they choose to reside: She Who Watches is believed to make her lair deep underground within the winding, claustrophobic tunnels of the Underdark, remaining reclusive and secretive. The Traveler, however, wanders the open air of the surface world, never staying in one location for very long and openly interacting with mortal races should they come across him.
It is for this reason those who "worship" the Traveler will often describe their pious relationship in terms that would imply they're not pious at all. The Traveler does not desire "worshipers", in fact teaching against it, as the worship of a god implies a form of binding interaction that goes against The Traveler's very being. Those who admire The Traveler were often born with or developed a strong feeling of wanderlust or curiosity, and so The Traveler is often viewed as the patron deity of merchant caravans, adventurers, explorers, and vagrants, and many of these groups will pray to him for protection on their travels before making lengthy trips.
A notably unusual behavior of The Traveler is how he interacts with mortal races. While it is not uncommon for minor gods to act within the Emergent Plane, most of these deities prefer to do so rarely and with a specific purpose, and appearing before a mortal to interact with them directly is typically a life-changing event. This is not so with The Traveler however, as he has no issues with greeting mortals that happen upon him during his wandering, sometimes even remaining with them for a time, though often he maintains some form of disguise while doing so. It is this blasé behavior regarding mortal interaction that leads some to claim that he's not a deity at all, and rather just an immortal, a belief that were one to ask him about, he'd likely laugh off as semantics and go on with his business.
His origins are a matter of some debate: As mentioned, some believe he is not a deity at all. Some think that he might be a child of Thaemenar, as their mutual appreciation for the world seems fitting. Some think he is a manifestation of the wanderlust that drives mortals to abandon everything for adventure. Despite his general openness, if one were to ask him about his origin he would likely shrug off the question, and those who revere him would likely tell you that asking him is impolite as he does not think one should dwell on their history, and instead look to the future and new adventures.