The following is a list of characters that appear in the American animated series ThunderCats, its 2011 reboot, ThunderCats Roar, and its related media.
Original ThunderCats
Lion-O
Lion-O (voiced by Larry Kenney in the original series, Will Friedle and Tara Strong (young) in the 2011 series, Max Mittelman in ThunderCats Roar) is the leader of the ThunderCats and is based on the lion, who inherited the position of "Lord of the ThunderCats". He wields the Sword of Omens, which possesses various magical abilities, most notably allowing him to see across great distances with "Sight Beyond Sight", and the Claw Shield, a gauntlet that launches grappling lines from its claws. The Sword was forged from the same star as the Sword of Plundarr, with the Eye of Thundera embedded in its hilt once belonging to a beast who Jaga's ancestors imprisoned in a gem after sacrificing themselves to save the Thunderians from him. Though twelve years old at the time of Thundera's destruction, Lion-O aged to adulthood during the trip to Third Earth when his suspension capsule failed to prevent him from aging. Throughout the series, he matures and learns what it takes to be a true leader. In the latter half of the first season, he undergoes the "Anointment Trials", consisting of contests of strength, speed, cunning, and intelligence, and the Mutants unsuccessfully attempt to exploit him to leave the ThunderCats without a leader. After defeating Mumm-Ra in the heart of his pyramid, Lion-O is crowned the Lord of the ThunderCats in an inaugural ceremony. In the 2011 series, Lion-O is a teenager both mentally and physically. Though hotheaded, he is patient and understanding and seeks for the races of Third Earth to be treated equally. Initially, he is the only one to believe that technology, a foreign concept to the ThunderCats, and Mumm-Ra exist. His mother died in childbirth, and his ancestor, Leo, assisted in defeating Mumm-Ra. After Cheetara, who he has feelings for, confesses to Tygra, he attempts to court Pumyra; however, she reveals her loyalty to Mumm-Ra and that she was manipulating him. In ThunderCats Roar, Lion-O is depicted as being child-like, with his antics annoying the ThunderCats. Lion-S is his long-lost sister. He is known as León-O in the Spanish version, Leo in the German version, Starlion in the French version, and Lion in the Brazilian version. He was originally known as Lion-L in the English version. Creators Ted Wolf and Leonard Starr described Lion-O character as being based on "Courage".
Panthro Panthro (voiced by Earle Hyman in the original series, Kevin Michael Richardson in the 2011 series, Chris Jai Alex in ThunderCats Roar) is based on the panther. Physically the strongest of the group, he is skilled at martial arts and serves as the chief mechanic/engineer and pilot for the ThunderCats with his knowledge. With help from Tygra, he builds the vehicles the ThunderCats use on Third Earth, such as the ThunderTank, Feliner and ThunderClaw, ThunderStrike, and HoverCat. Despite his loyalty to his friends and duty, living by the ThunderCats warrior code, and calm and collected, he can have a short temper. He wields a pair of nunchaku with open-away cat-paws, and the spikes on his chest bands can be used as projectile weapons or rappelling lines. In the 2011 series, Panthro is one of Claudus' soldiers, who is sent with his friend Grune to find the Book of Omens. During their search, Grune betrayed Panthro and Mumm-Ra was awakened; in the ensuing struggle, Panthro fell down an abyss and was presumed dead. However, he survived and constructed the ThunderTank, which he uses to save Lion-O's group from Slythe's platoon. He is later revealed to have known Dobo when they were slaves in a gladiator arena called The Pit run by the Dogs, with Dobo coming to resent Pantro when he escaped after learning that they were to face each other in a deathmatch. Though he questions Lion-O's ability to lead, Panthro eventually accepts him as the new king. When Grune and Slither Panthro attack the Elephants' village against Mumm-Ra's orders, he duels with Grune and loses his arms while trapping Grune in the astral plane, with the Berbils later building him mechanical arms. Creators Ted Wolf and Leonard Starr described Panthro's character as being based on "Physical strength" and "Death".
Tygra Tygra (voiced by Peter Newman in the original series, Matthew Mercer in the 2011 series, Patrick Seitz in ThunderCats Roar) is based on the tiger and is calm and analytic, considering every part of the problem before making a decision. He is the ThunderCats' architect and scientist, having created the Cat's Lair and the Tower of Omens, and Lion-O often calls upon him as a second-in-command and for advice. He can create mental illusions and wields whip-like bolas, with which he can become invisible. In the 2011 series, he is the adopted older brother of Lion-O, who was a member of the Tiger Clan until the other cat clans forced them to live in the frozen mountains far from Thundera due to their loyalty to Mumm-Ra and the Ancient Spirits of Evil. They sent Tygra away from their home in the mountains when the Spirits demanded they slay Tygra in exchange for greater power. His piloting skills come from his ancestors, who served as pilots under Mumm-Ra. Sent to Thundera as a baby by his biological father Javan, Tygra was raised by Claudus and his wife. After her death, having both the right to succeed his foster father and the only mother he knew, Tygra grew to hate Lion-O and questions his decisions after he becomes the new Lord of the ThunderCats. Furthermore, Tygra fell in love with Cheetara when they met as children, though he believed that she never returned his feelings. Tygra and Cheetara become a couple after Cheetara confesses her love for him; soon after, Tygra meets his birth father and inherits his whip. In ThunderCats Roar, Tygra is depicted as a neat freak. He is known as Tigro in the Spanish, German and French versions. Creators Ted Wolf and Leonard Starr described Tygra's character as being based on "Integrity".
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