Bunga

Bunga is the overall deuteragonist of The Simpsons franchise. He is a young talking honey badger who has lived with the Simpson family since Homer and Marge adopted him as their pet after their wedding ceremony. He also possesses various anthropomorphic qualities, such as the ability to speak intelligently, drive a car, and walk bipedally. Despite behaving, looking and sounding like a child, he is already a full grown up, and loves to drink and smoke. He also has a particularly big and strong, yet immature sense of humor, and has a frequent tendency to purposely annoy those around him as a mean to amuse himself, especially Homer and Simba. He is also Homer's best friend, despite Bunga's vastly superior intelligence. On several occasions, Bunga had to explain Homer's inability to do various things, such as haggling over prices in "Chitty Chitty Death Bang". In Bunga Goes Back to College, it's revealed that Bunga went to Brown University, but did not graduate.

In the film series, Bunga serves as the deuteragonist in The Simpsons Movie and Pollution, a major character in Dawn of the Neptunians, one of the two tetartagonists in Back to the Multiverse (alongside Simba), the main protagonist in Fallen Kingdom and the tritagonist in Dominion. He also appears as a supporting character in Star Wars: The Last Jedi and Star Wars: The Rise of Skywalker.

Homer Simpson
Homer Simpson is Bunga's best friend and older brother figure.

Marge Simpson
Bunga shares a brother-and-sister-like relationship with Marge Simpson.

Simba
Bunga and Simba have a very competitive relationship. They are constantly at odds and fight, yet show affection for each other several times, so much that Simba is probably Bunga's best friend after Homer. In the episode "Bunga and Simba", the two finally admits that they love each other as friends, and give each other life purposes.