Berserker:
Can enrage once per day per 4 levels. Enrage gives +2 to hit, +2 Damage, -2AC and immunity to Charm, Hold, Fear, Maze and Imprisionment. They can only put one slot in ranged weapons and cannot be lawful.
Kensai:
Bonus +2 AC
Every 3 levels gain +1 to hit and +1 to damage
Every 4 levels they get -1 speed factor (it can only be so low though, 0)
Can use KAI once per day every 4 levels. This lasts 10 secs and all next attacks do FULL damage
They cannot wear armour, bracers, shields, helmets, use missile weapons and cannot be chaotic.
In ToB, archers bonuses slow to +1 every 5 levels after 18. Kensai's still get them every 3 levels although the order changes:
Bonuses at levels: 1, 3, 6, 9, 12, 15, 18, 20, 23, 26, 29, 32, 35, 38 (not sure why it goes from 18 to 20 but it did for me!)
Wizard Slayer:
+1% MR up to level 20, and +5% per odd level after that IIRC (still +1% every other level)
Can only use magical armour/weapons i.e. no rings, amulets etc.
This info is all in the manual, and you can get a full kit description before creating a character though
All the kits obviously have adds and disadds, and each has his own. My fav is the kensai because the ability to hit for 14 damage higher than a standard fighter each hit which translates to around +70 damage per round more (attacking 5 times dual wielding for example) is extremely desirable.
I wont go into the high level abilities common to all fighters and that's more ToB.
(EDIT: Had some minor SP's)
[ 01-27-2002: Message edited by: Jim ]
[ 01-27-2002: Message edited by: Jim ]