at 15 it was relatively short - “fell to her shoulders”
quick-tempered
combative/confident/had no problem with confronting someone who was deserving of it
in no short supply of insults - “arrogant, bullying toerag”; “I wouldn’t go out with you if it was a choice between you and the Giant Squid”; “fat head”; “I’d wash your pants if I were you, Snivellus”
independent/strong in that she rightly saw absolutely no problem in dropping a friend the moment they mistreated her and let no one else control her - “You’re not going to - I won’t let you -” “Let me? Let me?”
exceedingly smart, especially in Potions - ”one of the brightest”
“vivacious”
“charming”
had a certain edge that could be compared to traits found in Slytherins - “I used to tell her she ought to have been in my house”
“cheeky”
made her anti-Dark Arts stance very clear and warned Snape well in advance that she wouldn’t stand for being friends with someone involved in them