Yokozuna Konishiki. Sumo's 17th Yokozuna, but was actually more dominant before he attained the rank of Yokozuna. He retired in 1901.
Ozeki Umenotani (Future Yokozuna). The great rival of Hitachiyama and was promoted to Yokozuna at the same time. They brought sumo into the modern era along with increased popularity!
Sekiwake Hitachiyama (Future Yokozuna): The great rival of Umenotani! He eventually went on to head the Dewanoumi Stable and train three Yokozuna himself. At the time of his death, he was the most successful and influential Yokozuna.
Sekiwake Araiwa (future Ozeki): Not a particularly dominate Ozeki. He retired in 1909.
Maegashira Sakahoko: He bounced around the high Maegashira-ranks and sanyaku ranks before retiring in 1907.
Yokozuna Hachijin: He was a Yokozuna in the Osaka Sumo Association although he retired in 1874 and headed up that organization until 1899.