I'm thinking of a Kenshiro fist of the north star Build

[peace through power]

20 str 20 agi and 20dex viable?

[Altos]

For unarmed builds, Strength and Dexterity will compete with each other for things like damage and hit%, in most cases, so I would reccomend you build more into Constitution and less into Strength. (To explain that differently, if you have 10 Strength but only 6 Dexterity, Strength will take priority in determining things.) Definitely some Will too, because a pure unarmed build will not do very well at all in the early game without some form of backup.
I'd also reccomend Agility, just so you have more movement potential and won't get your ass fully kicked in.
So I'd say you should start with something like: 6 str, 7 dex, 7 con, 7 agi, 3 per, 7 will, 3 int.

[Big Boom Boom]

You only get 1 stat point per level and max level is 25, so total 6 stat point by leveling up. Impossible to get 20 in one attribute.

[Qiox]

Originally posted by Altos:

For unarmed builds, Strength and Dexterity will compete with each other for things like damage and hit%, in most cases, so I would reccomend you build more into Constitution and less into Strength. (To explain that differently, if you have 10 Strength but only 6 Dexterity, Strength will take priority in determining things.) Definitely some Will too, because a pure unarmed build will not do very well at all in the early game without some form of backup.
I'd also reccomend Agility, just so you have more movement potential and won't get your ass fully kicked in.
So I'd say you should start with something like: 6 str, 7 dex, 7 con, 7 agi, 3 per, 7 will, 3 int.

Will ????? If you are not taking Psi, will is useless.

[ChaosPandion]

The implication of what Altos said is that ♥♥♥♥♥♥ should take a Psi skill as a backup, probably Telekinesis.

[Altos]

Originally posted by ChaosPandion:

The implication of what Altos said is that ♥♥♥♥♥♥ should take a Psi skill as a backup, probably Telekinesis.

Exactly.
Personally, I've found that purely unarmed play is near impossible in the early game if you don't have some other way of supporting yourself until you can unlock the very good melee feats like combo, crippling strike, lightning punches, and access to things like pneumatic gloves, etc.
Of course, this is all personal choice, and if you really want to go purely unarmed, then have at you, but just know that you're going to get your ass kicked endlessly (especially come the end-game) because you just won't be capable of taking on large groups of enemies all at once. Psi enables you to stave off larger groups through AoEs, enraging your enemies to attack each other, freezing them in place so you can catch your breath, etc.
Other useful backup strategies for melee include traps to lead your enemies into if you have to retreat, crossbows to apply those nasty poisons and stuns, and of course pure gunplay to just burst your enemies or shoot them in the head.

[A.W.S.H.]

I'd never put perception below 5 or even 6, unless you have high HP and/or heavy armour. Mines and invisible enemies are gonna ♥♥♥♥ you up otherwise.