I have to say i liked Roo quite a bit=D
Two people off the top of my head i can think of that i don't really like are;
Miranda, you know what i'm talking about. Every time she comes up this is what I think "Oh great, its HER AGAIN"
Then Magnus, This might change after i read woamg, but right now i just dislike him, hes too powerful for the amount of back ground knowledge we have on him, and too me he just doesn't seem very likable as a character.