At first, Puck seemed like a sworn enemy of the Glee club. He played football and bullied Kurt.

While he still goes back and forth from tough jock to gleeful singer, there's clearly a soft side to this character. He's proud of his Jewish heritage and crushed on Rachel briefly.

He also knocked up Quinn. That was a big mistake.

Puck Quotes

Dude, my bowels have better moves than you.

Puck

Cougar: Is that a nipple ring?
Puck: Yeah. I'm pretty rock 'n roll.

Glee Quotes

Rachel: I'm just scared. I haven't been this scared in my whole life. You know, when I was in high school and I had all these big Broadway dreams, I just got used to everyone laughing at me and I figured one day I would make it and I would show them that I'm not a joke anymore. And then I did and it all fell apart and I realized that there is a whole different kind of lauging that is way worse. So...I can't. I can't fail again.
Mercedes: Rachel, we're all going to fail again and again...the hardest part is just getting up, shaking it off, and getting on with it. Let me tell you this, when you sing? Nobody's laughing.

God as my witness, I will break her down.

Santana