Bronze Kneecap

The Bronze Knee Cap is a major comic book supervillian in the Fairly OddParents. He is featured in some of the episodes in which Timmy Turner reads or wishes himself into the Crimson Chin Comic Book.

Powers
The Bronze Knee Cap's major (and possibly only) power is his ability to repel bullets, e.t.c off his "knee cap" at the top of his head, hence his name.

Why did he become the Bronze Knee Cap?
Before he became the Bronze Knee Cap, he was a citizen who repeatedly entered the same contest... and always ended up in 3rd place. One day, the Crimson Chin was in the same competition. The Chin tripped up the to-be Bronze Knee Cap... which gave him bronze again. To get revenge on the Chin, the Bronze Knee Cap smelted all his bronze trophies and became... The Bronze Knee Cap!

This information was revealed in "The Masked Magician".