Unlike other known Pride Landers, Scar had a dark orange (deep brown in one painting) coat with a sleek, thick darker brown mane. He had a triangular face and a pale muzzle and underbelly. His eyes were green, with a dark scar running down the left one. He was a very lean lion, especially in comparison to his brother.
In The Lion Guard Magazine, Scar is shown as a burnt orange lion with a black mane and paler fur on his muzzle, toes, and underbelly. Tufts of black fur are present on the joints of his forelegs. The fur on his lower jaw is long, and his large nose is black. He has a long muzzle, sharp features, and a thin pink scar over one eye.
As a fiery spirit, Scar has dark orange brown coloring with a yellow nose and markings on his ears and the edge of facial fur. He has pale yellow eyes. His scar is shown as pure white.
Scar cared only for himself. His selfishness fueled his anger.
Scar's personality is the polar opposite of Mufasa's: He is wicked, mean-spirited, power-hungry, envious, psychopathic, cruel, manipulative and pure evil. His jealousy stemmed from the fact that his brother was chosen to be King. Scar was so hungry for power that he resorted into removing his own family permanently and destroying the kingdom. It was his thirst for power that caused him to lose the Roar of the Elders. He doesn't believe in the Circle of Life concept and cares only for himself and his own glory. He is also a great orator and a first rate actor, but incredibly insecure, as he never wanted to hear the name of his brother mentioned after he took the throne. His voice actor describes him as a menacing, malevolent character. He is one of the most intelligent creatures in the entire franchise.
Before Simba was born, Scar was tasked with leading the Lion Guard and was bestowed a power called the "Roar of the Elders" by the Great Kings of the Past which, when used, would cause the Great Kings of the Past to roar with him. However, that power went to Scar's head, and he believed that with this power he should be the king instead of Mufasa. So he planned to dethrone Mufasa, by using the Roar of the Elders. When the rest of the Lion Guard refused to aid him in his plot, Scar destroyed them by using the Roar of the Elders, and as a result, Scar became weakened by this event, losing the Roar forever by using it for evil. In the years that followed the Lion Guard's downfall, Scar focused his life on plotting for his brother's throne and continued to devise schemes with the hyenas to rule the Pride Lands.
After Simba was born, Scar plotted to kill both him and his brother. In the end though, he was able to murder Mufasa, and convince Simba to run away; however, when Simba came back as a young adult, he battled his uncle and reclaimed the Pride Lands.
Sometime prior to his death, Scar selected Kovu to be the next King. Kovu is the son of one of Scar's followers, Zira, whom Scar had a close relationship with and had informed about the Roar of the Elders.
After Kion is told that he will be the leader of the new Lion Guard, Simba and Rafiki show him the history of the Guard using paintings within The Lair of the Lion Guard, including Scar's leadership and how he lost it.
Later, when Mzingo informs Janja's Clan of Kion's new position, Janja wonders how that could be possible, since Scar was the last lion to lead the Guard, up until he destroyed them.
As Kion and his family disscuss Makuu's rise to power, Nala gently reminds Kion that Simba had to fight Scar to reclaim his leadership, implying that sometimes fighting is the only way. Scar's name was mentioned again when Kion backed down when using the Roar in a state of anger, saying that he did not wish to become like his great-uncle.
It is revealed that a group of lionesses were loyal to Scar during his reign. Among those lionesses was Zira, with whom Scar was close, shared the secrets about the Roar of the Elders.
It is also revealed that Scar chose Zira's youngest cub, Kovu to be his successor as King. Sometime after Scar's defeat, Simba banished Zira, her family and other lionesses loyal to Scar from the Pride Lands to the Outlands. Zira mentions Scar multiple times, claiming that if it weren't for Simba, Scar would still be King. But Kion says that Scar was never the real king. Furious, Zira orders an attack on Kion. However, just before the Outsiders can hurt him, Zira offers to forgive him if he will join her, and leaves him in the care of her pride while she goes to fetch her cubs.
During the final fight between the Outsiders and the Lion Guard, Bunga urges Kion to use his Roar, but Kion worries that he will lose the Roar as Scar did for using it against other lions. Despite Kion's fears, Bunga insists that Scar did not lose his Roar because he used it against other lions, but because he used it for evil. Kion then uses the Roar successfully and blows away all the Outsiders.
A painting of Scar and how he destroyed his Lion Guard is viewed by Kion in the Lair after he uses the Roar in anger when saving his mother, Nala, from Janja's Clan. Kion later talks to Mufasa, who told him that Scar held no interest in helping others, caring only for himself.
After discovering Kion's secret of speaking with Mufasa, Ushari starts pondering how he can use that information for his own benefit. He runs into Janja's Clan, and in order to save himself from being eaten, Ushari starts trying to bargain with Janja, telling him of Kion's secret. The pair wonder if they can bring Scar back to life, and do some research. After luring Makini into speaking with her mentor about it, they discover a way to bring him back by using a Bakora Staff and a powerful Roar near the volcano and get to work on a plot.
The hyenas steal Makini's Bakora Staff and, knowing that Kion's Roar is most powerful when his loved ones are threatened, kidnap Kiara, dragging her back into the Outlands with them. Although the Lion Guard save her, Janja manages to taunt Kion into using the Roar, which causes the volcano to erupt. Once they have left, Janja enters the volcano and finds out that Ushari is still unable to summon the lion. In a temper, Janja grabs the staff and throws it in. With a small eruption, Scar appears and, after being questioned, introduces himself.
Resurrected, Scar begins to plot his revenge on his nephew Simba and reclaim control over the Pride Lands, first forming an alliance with Ushari and Janja and his clan. Upon learning from Ushari's Skinks spies that the Lion Guard has accidentelly awakened Makuu and his float from their hibernation during the dry season, Scar sees this as an opportunity to wreak havoc in the Pride Lands, and orders the Skinks to keep watch on the situation, and inform him of any changes.
When informed that a rebellious member of Makuu's float, Kiburi, has challenged the latter to a Mashindano, Scar decides this is the perfect opportunity to get rid of Simba, knowing that many Pride Landers, as well as the royal family will be in attendance. He orders Ushari to trick Kiburi into believing that if he ambushed Simba, he will rule the Pride Lands.
However, while Ushari succeeds in tricking Kiburi, the plan ultimately fails, due to the Guard. This also causes Kiburi and his three crocodile followers to be banished from both the crocodile float and the Pride Lands.
On their way in the Outlands, Kiburi and his followers run into Ushari, who takes them to the volcano, where Scar reveals himself to them. Scar explains his revenge plan to Janja, Ushari, Cheezi, Chungu, Kiburi and his followers, explaining his scheme to unify all the animals in the Outlands. With an army of henchmen at his side once more, Scar seeks to ignite a hostile takeover of the Pride Lands to reclaim the kingdom as his own domain, and break the Circle of Life for good.
Upon hearing from one of Ushari's spies that Beshte has ended up in the Outlands alone, Scar states the perfect opportunity to eliminate the strongest of the Lion Guard, which would weaken it. After Cheezi and Chungu question it, Scar irritably explains that the heat of the Dry Season weakens hippopotamuses. He states that due to Beshte's trust in the skinks, it wouldn't be difficult to take advantage of this, and states that the skinks would lead Besthe to the Rocky Plateau, where Janja, Cheezi and Chungu could trap him.
The plan nearly succeeds, but is ultimately thwarted when the rest of the Guard arrives, and Kion uses the Roar of the Elders to send the hyenas flying away. After landing near the volcano, Janja, Cheezi and Chungu decide not to return to Scar immediately, knowing that he will be furious at them for their failure. As they begin to walk away, Ushari arrives and coldly says that Scar wants to speak to them now and he is not happy. Then, a small eruption can be seen at the top of the volcano, apparently confirming this.