I'm sorry, but I'm afraid I can't accept your character as it is. First of all, bloody jeans and t-shirt? For real? In the name of God, please modify your character's appearance in order to make sense with this setting. And if you can't figure out why jeans and t-shirt is wrong, then I'm afraid you're not fit for this campaign.

Your character's backstory is extremely lacking. Other than the fact that he is bipolar, which might be interesting if used in an interesting manner, you gave me absolutely zero information about him. Also, you're not going to play as an undead. Those who were brought to the Prisons were never killed, simply locked up.

Lastly, your character's sin is not nearly enough to gain him a lifetime of torment in the Prisons. As I said in the OP, only the greatest of sinners were sent to the Prisons: that means warlords, necromancers, and other such evil figures. Some (how many?) murders, one suicide and unbelief ain't enough: in the apocalyptic hellhole that was Sodom and Gomorrah after the fall of the angels, such acts were ordinary.