WattyWarriors4 got round one right, it was Hollyleaf!

Blood stains my paws
In the path I now walk
The weakling that was me
Disappeared long, long ago.
Because I was pushed to the ground
Unbelieved, teased.
Running away was better,
And I became better than them.
Look at me now
As I walk the cities
Always leaving blood behind
The blood of others.

Hint: from the Prophecies Begin arc!
Good luck!