Intelligent Weapon -> Create a God

The sword is supposed to be the same alignment of the character, and even change alignments if the character does, according to RAW. Edited to add: the player counts himself as Chaotic Neutral currently. All of my players are within a step of true neutral currently, but I expect that to shift over time.

The character is ill defined still, partially because of the thing that makes this campaign "silly:" the players are creating their own race as they go. Pathfinder has rarely-used rules for creating your own races where you buy certain abilities using Race Points. As they level up I'm giving them more and more Race Points to use to build their custom races. Yesterday was only their fourth session, so many of the players (including the one with the sentient rapier (if I called it a sword before, pardon me)) aren't fully in character yet and are still getting used to their mechanics. Two of the players are starting to show consistent characterization, but that doesn't include this guy yet.

Mechanically he's an Arcanist, which is half wizard, half sorcerer. He has average strength and has boosted Intelligence as far as possible. He's been using his race points mostly on getting damage reduction and spell resistance, so he seems pretty focussed on living and not doing that much damage. In one session he used summoned animals to basically tie up the attention of the enemies, though it's too early to say whether that's going to be a recurring tactic.

I could do. Realistically, it would only do that if it furthered its own goals, though maybe it thinks that the PC would screw it up if he knew the truth...