Kensai
HD:  1d10
Alignment:  Any Lawful
Weapon and Armor Proficiency:  Kensai are only proficient in two weapons, their chosen weapon and a secondary weapon.  Kensai are not proficient in any armor or shields.  
Prohibited Feats:  The Kensai cannot buy Weapon Specialization.  They cannot buy proficiency in any other type of weapon except for their two starting and they cannot buy armor or shield proficiency.
Class Skills:  Craft (any art form), Perform, Riding, Swimming, Climb, Jump, Balance, Bluff, Intuit Danger, Sense Motive, tumble, Spot, Listen, Move Silently, Hide
Skill Points:  2 + Int bonus
Multi-classing restrictions:  No Muli-classing
Magic Items:  Kensai cannot use a magic weapon of the same type as their chosen weapon, since this shows that they are unsure of their true skill.
Ex-Kensai:  Kensai whose alignment changes to a non-lawful alignment or show Dishonorable behavior cannot advance in the class until his alignment becomes lawful again or he proves himself not a Honorable.

Lvl	Base Attack Bonus	Chosen Weapon Atk Bonus	Fort Save	Ref Save	Will Save	AC Bonus	Init. Bonus	Dmg Bonus	Special	
1	+1	+2	+2	+0	+0	+0	+1	+0	Ki power, Psychic Duel	
2	+2	+3	+3	+0	+0	+0	+2	+0	Weapon Finesse	
3	+3	+4	+3	+1	+1	+0	+2	+0	Uncanny Doge	
4	+4	+5	+4	+1	+1	+0	+2	+1	Meditation, Ki Strike (+1)	
5	+5	+6/+1	+4	+1	+1	+1	+3	+1	Danger Sence	
6	+6/+1	+7/+2	+5	+2	+2	+1	+3	+1	Alertness	
7	+7/+2	+9/+4	+5	+2	+2	+1	+3	+1	Fear, Two Weapons	
8	+8/+3	+10/+5	+6	+2	+2	+1	+4	+2	Ki Strike (+2)	
9	+9/+4	+11/+6/+1	+6	+3	+3	+1	+4	+2		
10	+10/+5	+12/+7/+2	+7	+3	+3	+2	+4	+2		
11	+11/+6/+1	+14/+9/+4	+7	+3	+3	+2	+5	+2	Whirlwind Attack	
12	+12/+7/+2	+15/+10/+5	+8	+4	+4	+2	+5	+3	Ki Strike (+3)	
13	+13/+8/+3	+16/+11/+6/+1	+8	+4	+4	+2	+5	+3		
14	+14/+9/+4	+17/+12/+7/+2	+9	+4	+4	+2	+6	+3		
15	+15/+10/+5	+19/+14/+9/+4	+9	+5	+5	+3	+6	+3		
16	+16/+11/+6/+1	+20/+15/+10/+5	+10	+5	+5	+3	+6	+4	Ki Strike (+4)	
17	+17/+12/+7/+2	+21/+16/+11/+6/+1	+10	+5	+5	+3	+7	+4		
18	+18/+13/+8/+3	+22/+17/+12/+7/+3	+11	+6	+6	+3	+7	+4		
19	+19/+14/+9/+4	+24/+19/+14/+9/+4	+11	+6	+6	+3	+7	+4		
20	+20/+15/+10/+5	+25/+20/+15/+10/+5	+12	+6	+6	+4	+8	+5	Ki Strike (+5)	

Chosen Weapon:  The Kensai has one weapon that he wishes to use in the most perfect means possible.  He is so dedicated to its use that he has neglected all other weapons (other than a backup weapon).  If he uses another weapon besides his chosen weapon all experience point bonuses for defeating foes is halved.
Chosen Weapon Attack bonus:  When the character uses his chosen weapon, he gets to attack uses this column.  Use of any other weapon requires that he use his base attack column (with non-proficiency penalties if it is not his second weapon).
Ki power:  The Kensai may focus his Ki 3 + Wis bonus per day to do maximum damage with his weapon
Psychic Duel:  The character gets both his constitution and wisdom bonuses in a psychic duel.
Weapon Finesse: same as the feat of the same name.
AC bonus:  This is an insight bonus; the character also gets his wisdom bonus to his AC as per monk.
Inititiative bonus:  This only applies to the character's chosen weapon.
Damage bonus:  This only applies to the character's chosen weapon
Meditation:  The character may enter a state where he is oblivious to cold, heat, and hunger.  In this state he may gain 2 hours of rest for every 1-hour of meditation at 4th or higher level.
Ki Strike:  This allows the Kensai to use his chosen weapon (and only his chosen weapon) to strike creatures needing magic to hit as per the monk.
Uncanny Dodge: Cannot be caught flat-footed, always receives dex bonus and class ac bonus.
Danger Sense:. This ability allows them to know direction, number and distance of attackers; up to 150ft radius because of this they cannot be surprised. They can attack the same round of the surprise attack (Kensai can react 1st on the “surprised “ round)
Alertness:  The Kensai gets the alertness feat free at 6th level.
Fear:  The character may cause fear (as per the cleric spell) 3 + Wis modifier times per day, it is useable at 7th level.
Two Weapons:  The character may use the two weapons with no penalty as long as both are his chosen weapons.  If the character wishes to use other weapons, he must buy the ambidexterity and two weapons feats (but will still lose experience points).  It is useable at 7th level.
Whirlwind Attack:  Once per day the character may make a double-sized whirlwind attack (10 foot radius). The character does not have to have any of the prerequisites, but the character cannot use any other weapon than his chosen weapon, and it requires that the character not use his Ki power at all that day, it is useable at 11th level.
Note:  if the character buys any feat before he gets it free, then he does not get anything to replace it.