[@Sanctus Spooki] AND AS FOR ARMSTRONG'S WEAKNESSES: oh boy.

PRIDE. Armstrong has a sense of personal pride and a need to be incredible in every aspect of his life. This is both personally induced, as he has spent his life trying to become the perfect specimen of man, and created by his familial environment. There is this massive, overabundance of expectations from his family; their history, and their abilities, that he feels he must match. There are just so many things he must uphold and achieve. Success is not enough for him, to satisfy his pride, to maintain his pride. He is weak through the fact of his immense sense of dignity, honor, arrogance, vanity, self esteem, self importance, what have you.

FAMILY. Now let's talk about his family- except let's not, because I don't want to reveal spoilers. But suffice it to say that he puts up with a lot of shit from his family. Too much. It's a strain on his personal and professional life. And because of his strong relationship with them, they are an immense weakness of his. 

ROMANTIC. This is, in my opinion, the saddest weakness of all. Armstrong is an incredible romantic, and he's really sweet, and he wants to have this beautiful life, but he is alone. Nobody wants to be with him, let alone in a romantic capacity. He has no lifelong companion. He is completely without the love he so desperately wants. And the thing is, he knows this. He is not blessed with ignorance. The poor dear is aware of the fact that though he has all of these hopes and dreams, they won't be fulfilled. He will likely die alone. And it haunts him.

[@Tangletail] Once again, thank you, friend. :)