In the Lion King Mufasa and Taka story, Taka's transformation into Scar is likely a result of a combination of factors. He was probably always a bit of an outcast or had a sense of inferiority compared to Mufasa. An incident occurs that gives him a scar on his face. This physical mark becomes a symbol of his bitterness and his new identity. It's possible that the scar was obtained in a territorial fight or during some sort of power struggle within the pride. After getting the scar, he becomes more embittered and resentful. His appearance changes, and so does his attitude. He starts to plot against Mufasa, and with his new scar, he is no longer just Taka but is now known as Scar, a name that strikes fear and represents his new, more devious self. As Scar, he is more conniving and determined to take over the throne from Mufasa, using his new - found identity as a sort of shield and weapon in his devious plans.
Well, Tiki Tom's fictional characters could be anything. It could be a group of space explorers or mythical beasts. Without more specific details, it's hard to say exactly who they are.
Since we have so little information about 'taka my first story', it could be a wide variety of things. It could be a story told from the perspective of Taka about their first encounter with something new, like their first day at school, first love, or first job. It might also be a story within a specific cultural or creative context that we are not aware of.