Once again, the rules: Only your main character can cast Find Familiar, and then only if your character can cast Wizard spells. If your Familiar dies, you may cast the spell again to get a replacement, but you may not have more than 1 Familiar at the same time. Note that when your Familiar is out on its own, it may get lost at times, when the party moves from one area to another, so either keep your Familiar safely tucked into your Backpack or keep track of it at all times, in case it gets lost. If it does get lost and you can't find it again, you will not be able to summon another one. Each Familiar has its own number of hitpoints�when you summon your Familiar, your maximum hitpoints will increase by an amount equal to half of your Familiar's total hitpoints. Most Familiars have 24 hp, granting you a 12 hp bonus, a nice benefit for a low-hp Wizard or Rogue. Note that a Sorcerer would be a fool to choose Find Familiar as one of his spells, as you only need to cast it once. Just find a scroll and use that. All of the Familiars can Pick Pockets, but only the Ferret has any appreciable skill in the area, and even then it isn't safe, unless maybe you cast Luck on it first or something. Some of the Familiars can Detect Traps, but they cannot Disarm them.

Which Familiar you will get is determined by your PC's Alignment, as follows:

Alignment	Familiar	AC	HP	Notes
Lawful Good / Neutral Good	Psuedo Dragon	-2	24	50% magic resistance, melee attack can knock victims unconscious, casts Blur
Chaotic Good	Fairy Dragon	4	24	32% magic resistance, can cast Mirror Image and Invisibility 10' Radius once per day
Lawful Neutral	Ferret	0	24	50% magic resistance, 75% Pickpocket, 40% Stealth, 20% Detect Traps
True Neutral	Rabbit	-4	16	50% Detect Traps, 30% Stealth, 75% resistance to fire, cold, and electricity, moves as though permanently Hasted
Chaotic Neutral	Cat	0	24	50% magic resistance, 99% Hide in Shadows & Move Silently
Lawful Evil	Imp	2	18	25% magic resistance, can cast Polymorph Other
Neutral Evil	Dust Mephit	6	24	10% magic resistance, can cast Glitterdust twice per day
Chaotic Evil	Quasit	2	24	25% magic resistance, can cast Horror

When your Familiar is out of your pack, you can talk to it�it won't provide you with a wealth of new information, but you can pet it or punish it if you want to. This is also how you get items that your Familiar has pickpocketed. Make sure to heal your Familiar if necessary.