Well...
Peter is Uluru, Evidence as follows:
- Peter and Sylar are the only two powerful enough to be Uluru.
- All of his powers like regeneration etc. could be him being Invincible, like Uluru.
- His power is controlled by emotion and being betrayed or hurt by someone could turn him into Raging Uluru.
- When Peter Fought Isaac in Unexpected his voice became deep land distorted, Like Uluru..
- His name translates to the Latin term Petra, meaning rock.
- In the graphic Novel Isaac's first time, after a young girl dies after Isaac shows her a painting of her death Uluru appears to Isaac and says "Isaac, what have you done?!" and Peter says the same after Isaac shoots simone.
- Hiro's confrontation with Uluru may have already occurred in Powerless when he and Peter fought.
There

judge as you will.