@MasterSpark, I know this is a bit late, but here are my thoughts on Helena. In my opinion, she's a very three-dimensional character, i.e. there are clearly several layers of personality, or at least that is what I interpret from reading your IC posts. First, there is the thin sheet of dignity which she puts up, in order to do her duty and impress, as well as distract herself from her own worry, and keep herself cheery (as a vampiric child, she is able to delude herself quite well). Then, the childish distress and frustration that comes as a result of her continual lack of understanding of the vampiric way of life and, I suspect, some amount of general upset at her condition as a vampire and her seemingly fixed/slowly moving place in vampire society (i.e. the contempt with which some view her due to being an eternal child), the lack of good parental guidance, and the brutality which (most) children aren't mature enough to ever really accept.
There's a third layer of Helena (from my perspective at least - although you may have written her with different intentions). That is the mistrust and insecurity which creates the other two layers, and it is why I think she's a rather tragic figure, because she's defined purely by her own fear and sense of loss.
She's so grim, and yet at other times, she's pretty optimistic, and that's why she's a wonderful character. It doesn't suggest she's bipolar or extremely moody for someone of her age group: just a very complex personality that accurately reflects the (un)life experiences of an aristocratic child who happens to be a killer.
What have you decided about her brain development, given that we (in RL) don't know exactly how the brain develops? Has she got the raw intelligence (but not the judgement) of an adult? Could there be some way (e.g. a plot twist) for her to 'unlock' a more mature mindset? It's a really interesting character you've got here; I'm looking forward to seeing how you develop Helena over the course of this RP.
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What do you think of Morty? Am I RPing him properly? What are his flaws (I'm not talking in terms of morality; those are obvious. :tongue). What I mean by this is: has there been anything that's stretched credibility/made him a bit of two-bit villain or one-dimensional, and, if so, how could I fix it? I just want to make sure my character is as enjoyable for other RPers as possible, and also avoid godmodding and the like.