Rules: Familiars and Animal Companions

Familiars work differently in NWN than they do in tabletop D&D. If your character has a familiar, you get two abilities – Summon Familiar and Possess Familiar. The former is usable once a day and makes your familiar appear next to you. The latter can be used whenever your familiar is summoned, and allows you to control the familiar like you would your character.
Because of the way this works, and because familiar AI can be stupid and get them into trouble easily, I assume that familiars are interdimensional creatures for whom death on this plane of existence is a temporary inconvenience. So you can re-summon your familiar after it dies, and that’s cool.
Possessing your familiar is different. I prefer to treat this as an OOC ability. Your character does not use the familiar as a puppet – instead, you as a player are changing which of your characters you are currently controlling. Anything your familiar sees or does but your character isn’t aware of is OOC info with regards to that character. Additionally, your familiar is a character too, and you should have them behave appropriately. Don’t just use them as scouting robots.
You can use a keyboard shortcut to talk through your familiar without possessing them. I’m pretty sure it’s a semicolon followed by the text you want your familiar to say: “; *barks, tail wags, licks your hand*” If you do this, remember that most familiars have animal intelligence and can’t talk.

Rules: Familiars and Animal Companions

Luminiferous Æther SeaWyrm