Nim is a Noble Wolf standing at 3'2" tall at the shoulder. The Noble Wolf is a sapient version of the standard wolf, meaning he is fully self-aware. 
Nim has orange eyes with an orange-ish brown and tan fur. He also has a more reddish brown fur for the tip of his tail, ears, and the toes of his paws. One his paws, he has brown pawpads with the "heel" pad on his front legs. Over his left eye are 3 scars he earned in combat. His primary front, top fangs are especially long in a rather typical saber-toothed anatomy. The last things to mention, which are not always seen, are four feathery wings he had attached to himself with a magical surgery in order to grant him improved ability to traverse the worlds he explores.
Nim's typical attire for exploration and combat is a leather armor made with enchanted wooden plates. There is a focus on maneuverability for him with his armor, which leaves many parts unprotected but his priority is being able to dodge and fight with his instincts instead of just being an impenetrable fortress. His armor does include bone spikes to help with combat though, giving him artificial means of defending himself.
On the other paw of things, Nim also has a midnight lycanroc form he takes on sometimes when visiting certain worlds. This form stands on two legs unlike his normal self, but a lot of the other features are the same. 
As a lycanroc, he is a variant Fairy/Psychic type, with a longer tail than the normal variety and with slightly more defined thumbs. His outfit does have a lot of the same style as his feral attire, but across his chest is leather armor in the design of a chef's jacket as he is quite the skilled chef.
Nim's time in Faerun was riddled with fights against cultists attempting to bring about the end of the world, as they do. Though he was able to have a really good time there with his friends. He learned how to cook and even got married to his Best Friend Forever, Shenzi, an anthro hyena necromancer.
Granted, neither of them really understood the implications of marriage, but nor did they care about that. They declared they were BFFs forever and have been to this day. As he grew in power, he was able to bring about his faithful companion, Silver. A fellow noble wolf, though one of magical origin and drawn forth by his power rather than Selune's. They ventured far and even delved into the Fey Wilds for a time. Eventually his pack was going into a dungeon belonging to the cultists and were sucked down a whirlpool, presumably all dying in the process.
This was not the end of Nim's story however. The near-death experience of the whirlpool awakened power inside himself belonging to Porters, beings that are able to traverse the various realities via the use of portals. This being a desperate situation with new power had him porting uncontrollably for a few years. He attempted to bring Shenzi with him, but only managed to bring her essence with him to the new places. Eventually he found himself in a world that is just one giant city with new power. So far from his original home with Selune's powers coursing through him and with Shenzi's essence interfering, he lost his Paladin powers for a while and learned the powers of a Wizard.
Here he was able to train under one of the best chefs of the world and worked in their kitchen (though no one is able to remember how he cooks, he just does). He also settled down in Krei's house, becoming a bit of a roommate to the reclusive bird. While in this world he aided in overcoming a group attempting to once again bring about the end of the world by summoning these angelic beings that would essentially revert everything to where it all began or something along those lines. Nim did not really care so much about all of that, he was just there to help stop it.
He made many new friends there, from a death knight to a gravekeeper and was able to keep Silver with him as the two were connected though there was no Shenzi to be found. The wolf bartered for the seed of a tree that would produce healing fruit and planted in his friend Krei's backyard. This tree was ravenously hungry and started killing the plants around it, stealing their nutrients. He was informed of a quantum ham, a ham that was ever growing larger and decided the best place for this ham was under the roots of his new tree. Ever-growing food source meet ever-hungry tree. This caused some unforeseen consequences, such as the tree now existing in every reality at the same time as well it gaining sapience itself. The tree was named Tree by Nim (he's a wolf, what do you expect?) and he took her as his daughter.
Eventually he regained many of his Paladin abilities and powers, creating a sort of hybrid Paladin/Wizard ability set. Over the course of his story in this new land, he mastered his new Porter powers and was able to bring Shenzi back from inside himself. His new friends helped him in his ultimate goal: To slay, cook, and eat a dragon. Having completed his life's goal, and reunited with his Best Friend Forever, Nim, Shenzi, Silver, and Tree created the Tree Way Resort. This is a safe haven in a pocket reality that anyone friendly could travel to through Tree's ability to teleport people between realities. It is here that Nim retired from his adventuring life to run the best resort he possibly could.