What was he like?
The energetic Ninth Doctor could be serious one moment, then silly and funny the next. He liked the word FANTASTIC! and his accent sounded as if he came from the north of England.
What did he wear?
This Doctor liked to wear an old leather jacket. He had a couple of favourite jumpers too!
Why did he change?
To save his best friend Rose Tyler, the Doctor absorbed all the energy of the Time Vortex - something that's very dangerous. This caused every cell in his body to die, so he regenerated.*