Ok, wait a sec. I have lots of questions. Liliana looks very much like some other established characters on the site. It seems to me that in order for her to work well, she needs to differentiate herself from the other villains on the site. So, with that in mind,...
First, in your good traits/bad traits--i see nothing that tells me what her magical skills are. i dont' see any classes she excelled in or did badly in, so i am not getting a good picture of her. can you add to this section for me? (magical skills, not classes) second, i have a real issue with a 19 year old being such a skilled seductress and such a skilled villain. she's just too young for all that. I'd rather see her be a bit older or have you back down on all the excessive skill. she's just overpowered for her age. she might be aiming to age into that, to develop experience in doing some of those things, but its not realistic to think that she could do that when she was, most likely only a year or so out of Hogwarts.
She needs to be a halfblood because she's not a canon character. Site rules do specify that purebloods need to be canons. So, yeah. Halfblood it is.
Her history confuses me. Her bio mom who took such good care of her just up and left her in the rain? What? Why? Where was dad? That doesn't make sense to me. And--even if someone else did take her in, they would have surely had to get custody of her legally through the ministry of magic. It doesn't make sense that someone would have known her bio last name if she was an orphan. Besides that, we have sooooo many orphans on the site, that we aren't really allowing any more orphan characters anymore anyway. She does need to have some roots--either in a biological or adoptive family. I see the similarities between harry's start in the world and hers with the letters, etc, but it doesn't make sense in liliana's history.
Boyfriend's kidnapping--not enough information here. there is nothing to tell me that they have any evidence that he was kidnapped. Only that he came up missing. This bit does not make sense to me. and i'm not seeing the relevance to who liliana is now.
next--pickpocketting skills? it is not realistic to think that she would not have gotten caught her first time picking a pocket. that takes slight of hand and practice. its also not realistic to think she never got caught at theft ever.
and--what's she wanted for? you didn't specify. we have no history on that.
lastly, the whole vampirism thing. there is insufficient history on it, and, frankly, i don't think it helps her characterization by making her one, except to perhaps cause motive for killing. but, there's no backstory on how she became a vampire, how it changed her, etc. i'm not sure its necessary for her character if she really is evil. If its relevant, I need to see more on that and how it connects for her. i'd like to see her have some stronger motivations than that. on PA, the Ministry has always provided free blood for vampires so that it stops the feeding frenzies. There would be no reason for her to kill just for that alone.
I think its fine to want to make a villain but it isn't always easy to firm up the foundation underneath them so that they become individualistic. I want to see her work well on the boards for you. So--Try going back and looking for ways to make her a realistic exception to the norm. the questions I asked might guide you a bit.
And, as always, we will be glad to try to give you some guidance on how to frame her up so that she becomes successful for you!
k.