Logan （狮王, Shi Wang, Leo King）is a Robo-soldier from the 5th Universe. He is the first adversary to be seen against Kino and his friends and continued to be until the second half of the series. However, during the second part of RevEvolution, it is revealed that he is not as "evil" as previously thought. His main motivation is to atone for not being able to protect 'his lady' Phoenix, the wife of Hades, and has had a strong desire to become stronger ever since.
He borrowed Kino's energy lock 100,000 years ago so that he can enter Ultra Beast Form to protect his own people and Hades. Though he ended up losing to Titusz, he fullfills the promise of returning energy lock to Kino by himself when meeting Kino again after 100,000 years.