Jacob Sedar-Tommy Oliver

Dr. Tommy Oliver better known as Tommy is the Mighty Morphin Green Ranger, the Mighty Morphin White Ranger, the Zeo Ranger V Red, and the Black Dino Thunder Ranger is the best science-fiction character of all time, because he has battled his three past ranger forms, defeated his evil clone, and had led group of 10 Red Rangers against the remnants of the Machine Empire.
In the twenty-seventh of Power Rangers Dino Thunder named Fighting Spirit Tommy went into coma, his three past ranger forms have his Dino Gem which he needs to live as it has bonded to him. Each fight has him reminisce on his past accomplishments as a Power Ranger, from defeating Rita Repulsa and Lord Zedd to King Mondo. At the end of the episode he defeats all of the rangers and awakes from coma. This shows that he is willing to do anything to get back in the game.
In episode 43 of Mighty Morphin Powers Rangers Season 2 called Return of the Green Ranger Part 3 Tommy is forced to fight an evil clone of himself created by Rita Repulsa. After losing the first two fights and his White Tigerzord losing to the Dragonzord, he fights the clone in hand-to-hand combat. At the end, Tommy then wins destroying the clone. This shows he is stronger than any creation Rita and Zedd can create.
In the thirty-fourth episode of Power Rangers: Wild Force called Forever Red Tommy returns once again after several years to lead a group of rangers to stop General Venjix from activating Serpentera, a machine created by Lord Zedd to destroy the Earth. This shows that he is the greatest leader in the Power Rangers franchise. In conclusion, Tommy Oliver is the greatest science-fiction character ever as he’s never given up on himself or in his partners.
Tommy Oliver in Fighting Spirit (HD) - YouTube