Wandering Trader

Wanderer's Backstory
Wandering Trader is a cool guy he is also a figment of Brad's mind currently, he will become real later on. Wanderer (Trader) existed somehow when the nobody's team spawned around their world, when Timothy, Doggy and Joe were in the end dimension in season 2 episode 4 it is mentioned by trader that he found all these mob heads from collecting them from the nobody's world and the dragon head left by the nobody's in the end dimension.

Trader and Brad's Journey to New Mexico
They Both wanted an escape away from all the issues were happening on nirvana, they decided and picked New Mexico for a vacation.