Although he is killed by Walt in the end, the end of Breaking Bad and Walt's death is just further proof that Gus Fring is the most powerful character inside the universe of Breaking Bad. His power comes from his criminal empire, but it's also a function of his unique position in the community of Albuquerque. Fring's power extends to the DEA, the agency that exists to investigate him. They see him as a kind, giving citizen because of his charitable efforts.
He owns a chain of fried chicken restaurants that works perfectly as a cover for his criminal activities but also serves as another avenue through which he can accumulate power. His business interests are more focused on his work in the world of meth, but he can exercise plenty of influence through his legitimate business as well. On top of all that, he's got ties to Madrigal Electromotive GmbH, a conglomerate that has connections across the globe.
