Rex was originally a police dog trained for special tasks. His background involves various experiences that shaped his skills and instincts for solving crimes.
Oedipus Rex is neither a book nor a novel. It's a classic dramatic work that has had a significant impact on literature and theater throughout history.
A fanfiction might explore the Indominus Rex transformation in a more magical way. Suppose there is an ancient artifact in the park that emits a strange energy. When the Indominus Rex comes into contact with this energy, it starts to transform. Its body becomes larger and more muscular, and it gains the ability to breathe fire. This new power would turn it into an unstoppable force in the park, and the other dinosaurs would have to either flee or team up to face this new threat.
A fanfic could focus on Noah's perspective of being Rex's friend. Maybe Noah starts to feel a bit overshadowed by Rex's powers and has to deal with his own insecurities while still supporting Rex in their adventures. For example, during a mission where Rex is getting all the glory, Noah could be the one who actually figures out the key to defeating the EVO, but no one notices at first.
In the Invincible comics, Rex survives. The character's fate takes different turns, but death isn't one of them. The storyline keeps him involved and active throughout.