Sabo is the second in command of the Revolutionary Army. He was first introduced in a flashback. Sabo is a powerful character, who is able to fight with an Admiral (even though Sabo and Fujitora were just playing). Nonetheless, he proved to be an equal to Fujitora.
Sabo can use Armament and also Observational Haki. He possesses a type of Logia Devil Fruit called Mera Mera no Mi, which allows him to create and control flames. He was able to defeat a Vice Admiral and also Jesus Burgess which only a single hit. Moreover, he fought with the whole Marine division in Dressrosa alone.