I've been playing several variants of Kensai lately and have decided on my favorite. Now it's not the most appropriate in terms of RP, and doesn't really feel like a "Kensai", but man are they powerful and fun. N
Now pure Kensai IMO are vastly underrated in general. I've not found the lack of armor to be that big of a deal, as long as you're not trying to solo. And they are really the only fighters that really continue to scale and build, apart from Archers. Jaheria is a great partner for them for the Barkskin as well and if done right, Jaheria can be a great tank in BG1 and 2.
So anyway, the final build on this guys is basically: Daggers, Axes, and War Hammers.
This guy is great both in melee and at range, which is why I like them, because I like characters I can play either in melee or at range depending on the situation.
Now, the way I did it was going 3 pips in dual wielding and 3 pips in Daggers in BG1. I'm not sure that's really the best way to go. I think it was clearly the best way to go for BG1, but if you are planning ahead, maybe other approaches are better. There aren't great daggers early in BG2.
Now the best earliest throwing weapon you get in BG2 as far as I know is the Dwarven Thrower. But there are no throwing hammers in BG1.
So, you could do something like not going into two weapon style in BG1 at all, however I've always played Kensai with two weapon style, so that's a little iffy for me, but it makes sense.
If you don't go for two weapon style then you could put three pips in daggers and 3 pips in War Hammers in prep for the thrower, or you could put 3 pips in Daggers, 2 pips in Axes and 1 pip in War Hammers, knowing that when you hit 9 in BG2 you can put another pip in War Hammers. I think this is the best approach.
The thing about Kensai is that you don't really need a lot of pips in a weapon to be good with them. Indeed, even by level 9 you can use pretty much any weapon respectably, even with no pips in it.
The thing is that Daggers are far and away the best weapon for BG1, and ultimately they are the best throwing weapons for BG2 as well, but in BG2 there will be times when Axes and Hammers are very useful, either thrown or in melee.
IMO the way to go is to first get 3 pips each in Daggers, then 2 each in Axes and Hammers, and then start working on dual wielding. This also has the nice advantage of giving you piercing, slashing, and blunt type weapons for further opportunities for situational damage maximization.
Once you have 2 pips in dual wielding then get your third pips in Axes and Hammers, then get your third pip in dual wielding, then go for 5 pips in Daggers.
IMO, this is the single best pure "Fighter" character there is. You have ultimate melee and ranged damage, you deliver all types of damage (missile, piercing, slashing, blunt), with Tomes you have regeneration, you have high saving throws, etc. This build has it all and it has variety.