Buying GW2
The answer is no.
According to the user agreement it is not allowed to share accounts. So what you and your brother have been doing the last year is actually against the user agreement. The reason thats account sharing is not allowed is cause one person is responsable for everything going on. This also cause it often leads to ownership disputes. (like you actually allready have, you admit that it is your brothers account, but you claim to own atleast one character.
So your best bet is to start all over yourself, but strike a deal with your brother to help you on the way.
Arise, opressed of Tyria!
Yeah I guess I will… Though we have already started building up Twillight for our warrior but we will see what’s gonna happen next…
Well, you can make the Twilight and then give it to a character on your new own account. Just do not equip it or choose the stats. Those things make bind it.