Alright, so I’m assuming you're talking about the English-translated web novel series by Tang Jia San Shao, which is often just called 'Spirit Walker' (though the original Chinese title is 'Dou Luo Da Lu' and the protagonist there is Tang San, a spirit master). However, I’ve seen some confusion with another series called 'Spirit Walker' by a different author. To clear things up, if we’re referring to the cultivation web novel by Tang Jia San Shao set in the Douluo Continent, the protagonist is Tang San.
His abilities evolve massively. He starts with a dual spirit—the common Blue Silver Grass (which he cultivates into something incredibly potent) and the inherited Clear Sky Hammer, a top-tier attack spirit. Over time, he develops various spirit rings and spirit bones, masters the Mysterious Heaven Technique, and creates the Tang Sect's hidden weapons. His journey is really about turning a 'trash' spirit into something world-shaking, blending Eastern cultivation with a unique fantasy system.
If you meant a different 'Spirit Walker,' then we’d need more specifics, but in the most popular context, it's Tang San and his path from an ostracized kid to a god-level powerhouse.