No mean to offend, but to me, they all sound like your average MarySue-ish characters. If I could choose to add some characters, I'm not sure I would, I'm happy with the characters JKR created.

Plenilunio, you are a mind reader. "MarySue-ish" is the first thing I thought when I read the question.

i agree with the 2 people above, but if i HAD to choose i think this one would be more interesting

i agree too but, i think that i'd create another Slytherin (yeah, i know that it should be a gryffindor or a harry's friend, but i prefer that character): Mara Rousseau, she's the same age as Oliver Wood and she's a Death Eater.

That would be soo funny if he got in trouble often..hehehe wow,....my imagination is tooo wild

and dracos brother

this seems more shocking hahaha...though i am content with the characters that JK Rowling did create in the HP universe :)

Um none.

Really, I'm happy with the characters. But, I'm open-minded, and since Sirius is my favorite character, I had to choose this. Or maybe Draco's brother :) But I feel like if Draco had a brother in Gryffindor, his life would be like Sirius's. All the Black's before him were Slytherin's, they disowned him... That's how it would be for this non-existent character.