Mufasa

In the "Lion King" prequel story, Mufasa is depicted as an orphaned cub who is adopted by Taka (later known as Scar) and his pride after a devastating flood separates him from his family, essentially making Taka his adoptive brother; this allows Mufasa to grow up within the Pride Lands and eventually become the rightful king despite not being born into the ruling pride.

Key points about Mufasa's adoption:

Tragic event:

Mufasa loses his parents during a flood, leaving him alone and vulnerable.

Taka's intervention:

Taka, a lion from a different pride, finds Mufasa and takes him in, providing him with a new family.

Brotherly bond:

Despite not being blood related, Mufasa and Taka develop a close bond, which later becomes strained as Taka's jealousy grows.

Rise to power:

Due to his noble character and leadership qualities, Mufasa eventually becomes the king of the Pride Lands, even though he wasn't born into the ruling family.