Simba and Kion have a fairly close and affectionate relationship.
Initially, Simba was against informing his son about his destiny, however he agreed after Nala and Rafiki explained the importance of Kion's abilities. When Simba heard of Kion's choices for members of the Guard, he incorrectly assumed that Kion wasn't taking his responsibilities seriously. His opinion changed after Kion and his friends rescued Kiara from a stampede set by Janja.
He often gives Kion advice and comfort whenever he needs it. Simba also helped Kion defeat Reirei in The Kupatana Celebration.Never Roar Again.
Unlike Simba, Nala accepted that it was time for Kion to lead the Lion Guard, and showed immense pride in him when he and the Lion Guard defeated Janja and his clan. She often gives Kion the maternal advice and support he needs.
Although they are brother and sister, and they do love each other, Kion does not always get along with his older sister Kiara, due to the latter's arrogant and immature traits, as well as the fact that she does not always take her duties as the Princess and future Queen of the Pride Lands very seriously. Unlike Scar had for Mufassa, Kion apparently has no jealousy against Kiara for being the heir to the throne, actually once stating that while Kiara would be queen when they were older, he would be happy. This indicates Kion was glad his future wasn't decided for him.
Friends and Allies
Before discovering his destiny as leader of the Lion Guard, Kion and Bunga would play games such as Baobab Ball together. One day while playing this game, their ball fell into the Outlands which Bunga went to get back, but ended up being captured by two hyenas named Cheezi and Chungu. Luckily, Kion was able to save his best friend by using the Roar of the Elders, giving Bunga time to escape.
After being made leader of the Lion Guard, Kion choose Bunga to be the bravest member as he was the bravest animal he knew. Bunga along with Beshte (the strongest), Fuli (the fastest) and Ono (the keenest of sight) aided Kion in battling Janja and his clan and continue to help him in defending the Circle of Life and protect the Pride Lands.
After being made leader of the Lion Guard, Kion chose his friend Fuli to be the group's fastest member. She helped Kion in defeating Janja and his clan and continues to help him in defending the Circle of Life and protect the Pride Lands.
Kion chose his friend Beshte to be the strongest member of the Lion Guard. He helped Kion in defeating Janja and his clan and continues to aid him.
Kion is closer to Beshte than the other members of the Lion Guard, in "The Imaginary Okapi", when Beshte told the other members of the Lion Guard about his new friend Ajabu, however the latter kept on disappearing due to his shy nature, as the Lion Guard believed he was making them up, however Kion was the only member of the Lion Guard who believed Beshte, as he knows the latter never makes things up.
Kion chose his friend Ono to be the keenest of sight in the Lion Guard. He aided Kion in defeating Janja and his clan and continues to aid him.
Timon and Pumbaa are good friends of Kion.
It appears that Kion gets on well with Timon and Pumbaa as they cared for his father when he was a cub and that they are the adoptive uncles of his best friend Bunga.
At first, Kion distrusted Jasiri because she was a hyena, believing that all hyenas were evil. However they eventually warmed up to each other with Kion learning that not all hyenas are bad.
When Jasiri was threatened by Janja and his clan, Kion returned to save his new friend, before parting on good terms from her.
Like his family, Kion holds Pua in high esteem for his wise leadership.
Tiifu, like Kion is a member of the Pridelanders and is best friends with his sister Kiara. The two clashed in "Can't Wait to be Queen" when Tiifu, along with Zuri, served as an adviser to Kiara during her temporary queenship and made a snide remark at Kion because he wasn't as quick thinking as Kiara and she immaturely relished in her "power" as an advisor. Later, Kion was disgusted with Tiifu and Zuri when they allowed Kiara to meet with Janja alone as they believed she would be okay on her own.
However in "Fuli's New Family", Kion is seen smiling at Tiifu as she practices hunting, perhaps hinting that Kion and Tiifu made up with each other after he and Kiara returned to Pride Rock.
Zuri is another member of the Pridelanders and like Tiifu, is a friend of Kiara's. In "Can't Wait to Be Queen", Zuri served as an "advisor" to Kiara and laughed when Tiifu made a snide remark at Kion for not being as quick thinking as Kiara. Later Kion was disgusted when Zuri and Tiifu allowed Kiara to go and meet Janja alone and berates them for this. However, Zuri (out of arrogance) doesn't care what Kion said as he's not the Queen.
In the comic "The Day of the Crocodiles", if the reader chooses Fuli's idea, Kion would save Zuri from Makuu and his float. Afterwards, Zuri nuzzles a uncomfortable Kion, saying that she thinks he will grow into a big, strong and brave lion someday, perhaps hinting that she has developed feelings for him.
Ever since they first met, Kion and the Lion Guard have faced and defeated Janja and his clan members as they have no respect for the Circle of Life and keep trying to hunt the animals that live in the Pride Lands.
Cheezi and Chungu join their leader Janja and the other members of their clan in hunting the animals of the Pride Lands, but are always stopped by Kion and the Lion Guard.
After defeating Pua to become leader of the crocodiles, Makuu began to disrupt the Circle of Life by taking his float into Big Springs, chasing the hippos away and eating the fish there. He rejected Kion's request to leave Big Springs and tried to get him to fight, but to no avail.
Eventually, Kion returned and this time, used the Roar of the Elders to make Makuu and his float leave Big Springs.
Reirei, her mate Goigoi and their sons tricked Kion and the Lion Guard into thinking they were nice and convinced them to let them stay in the Pride Lands for Kupatana, to which Kion reluctantly agreed.
However after Reirei and her family attacked the other animals during Kupatana, Kion saw through her trickery and demanded that she and her family return to the Outlands. But Reirei tried to get Kion to give her and her family another chance, but fled when Kion's father Simba roared at the jackals.