Hmm, this is off the top of my head...about Hermione

I've been the smart one, and followed all the rules,
Up until I met them, They thought I was a mule,
I cried because I was sensetive, and I hated them,
But then they rescused me, and picked me up from where I fell.

Then they were in trouble, I had to do something,
They were really grateful, i'm so happy I could sing,
And now I have some friends, I guess I should losen up.
Ha! Look at Ron, pretending he's tough!

Now I am sitting with my friends, raising a goblet to Harry,
Oh, I mustn't dilly dally!

The last lines are weird I know.