Hi! No disrespect meant but I' d like not to change the personality, if you don't mind, because ooc I'm actually James' friend and he was the one that talked me into returning to PA after all these years. I liked it back then, so I decided to give it another try since I have some free time now... And one of the things we both agreed when he told me his idea, was that both of us plus another friend that will play my cousin ic, would be dark wizards, that had common goals, and would be best friends, and let's face it, you usually are best friends with people that have a similar personality to yours... When I was writting the personality bit, what I had in mind was what J.K. had wrote about Death Eaters and Voldemort, picking a bit of both and I came up with that... If you really want me to change it I will, but I think that for me, that character just wouldn't feel the same, and as much fun to roleplay with.
As for the "powerful, very skilled and resourceful" I meant like you said, for his age... A bit like Hermione, that was very powerful skilled and resourceful, due to her passion for studying and knowledge. Like I said in the history, all his life he has been interested on Dark Magic and related stuff, he has gained that interest from his parents, that being Dark Wizards, would teach him and foment his quest for power and darkness... All of that besides the research he had done in Hogwarts troughout the years... I don't mean to make him O.P., because he his only "great" in D.A. and D.A.D.A. which he spent all his life learning since he longed for them... As for the other subjects he is as good as someone who studies and likes to obtain knowledge... I've always heard and related since I was little to the sentence "Knowledge is power", and I kind of had that in mind while writing the character's bio... I also think he isn't quite done yet, thus why he wishes to go and work in the Department of Mysteries, so he can keep pursuing his need for knowledge in the Dark Arts in order to become powerful and ultimately feared by those around him... As for the flaws, I'll do my best to add more! I've tried to demonstrate that in order not to having vulnerabilities he had broke up with the love of his life, showing a bit of his humane personality, and for Dark Wizards, love would be considered one major liability, and I was planning to explore this particular liability in the future. I hope I have explained well my point of view, and that I can do the necessary changes to start enjoying PA!
Best Regards!