He has a secret that only few know. He is being watched, always, unseen,unheard. This secret is on the priority of global security. If only he knew what he was truely, what his secret is.
Created in a time of need, he was cast from the pride he was made to obtain, he is a warrior, and a leader.
A once noble man, he was tossed aside and tortured. He is an empty shell of what use to be Human.
A wonderer, a warrior. He is both cursed and blessed, he is feared and loved, but always misundestood.
The creation of intelligent magical weapons is not an exact science and there are occasional failures, as such think of causing a little more stress to your players by "rewarding" them with an insane magical weapon
Agrophobic, refuses to come out of the scabbard without a strength check to draw it.
Haemaphobic: afraid of blood, fight at a penalty against any blooded creatures but really good against undead, elementals etc
Schizophrenic, not just one mind in your sword, lets have half a dozen minds in there, all different and bound to cause confusion
the possibilities are endless