Howling Coyote
Explorer
What the players know is different than what the characters know. Although it still will be a slight spoiler. You could just have said that we wake up somewhere in the start without remembering who we are and why are we here, so no background is necessary. I think that wouldn't be a spoiler since that's probably the first thing you were going to post when you started the game anyway.
We could picture the assassin bit like Hugh the Hand (yes, I've read the Death Gate Cycle as well and liked it). A dark assassin who killed for money, but the events took hold of him, and he ended up being a hero.
Only thing is that I'm still bit worried how he could fit in this story. Maybe he could have gone through a slight alignment change since then (lawful neutral with evil tendencies). That would make it easier to get him along.
We could picture the assassin bit like Hugh the Hand (yes, I've read the Death Gate Cycle as well and liked it). A dark assassin who killed for money, but the events took hold of him, and he ended up being a hero.
Only thing is that I'm still bit worried how he could fit in this story. Maybe he could have gone through a slight alignment change since then (lawful neutral with evil tendencies). That would make it easier to get him along.