Kara Silverblade [Core; Two-Blade Swordswoman] (Human Female Fighter)

One big complaint that I keep hearing about Valeros is that he's 'useless' as a two-weapon fighter. That is..the reason folks play iconics is to fulfill a role or two and he doesn't fit either the damage monster or tank that most folks would be wanting a tank for.

I dunno. Most of the complaints are he doesn't fit a role and he fails to fit either with minimal role outside of combat. (Still working on the last part on this build... but that will come in time I'm sure)

Two-Weapon Fighter: Strengths: Feats. LOTS &  LOTS of feats. Hella lots. Class abilities: Armor and Weapon Training: Armor training reduces penalties and allows full movement in heavy armor (eventually). Weapon Training, like weapon focus/specialization for an entire category of weapons that ADDS in to weapon focus/spec feats. A bonus to save vs fear (working on the weak will save)
Weaknesses: A chronic lack of skill points. More than a wizard BEFORE int bonuses but still. Will Save. The Achilles Hell of the class. First and foremost focus is to ensure that you buff your will save if you can.

Pay no mind to the kaju in the background

Starting the Dance..(1st Level)

Kara Silverblade (Core)

Female human (Varisian) fighter 1

CG Medium humanoid (human)

Init +5; Senses Perception +1

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Defense

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AC 16, touch 13, flat-footed 13 (+3 armor, +3 Dex)

hp 13 (1d10+3)

Fort +4, Ref +3, Will +0

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Offense

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Speed 30 ft.

Melee two-bladed sword +4 (1d8+3/19-20) or

   two-bladed sword +2 (1d8+2/19-20), two-bladed sword +2 (1d8+1/19-20)

Ranged javelin +4 (1d6+2)

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Statistics

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Str 14, Dex 17, Con 14, Int 13, Wis 10, Cha 10

Base Atk +1; CMB +3; CMD 16

Feats Exotic Weapon Proficiency (two-bladed sword), Two-weapon Fighting, Weapon Focus (two-bladed sword)

Traits bully, reactionary

Skills Acrobatics +3, Intimidate +5, Perception +1, Survival +4

Languages Common, Shoanti, Varisian

Other Gear studded leather, javelin (4), two-bladed sword, 21 gp

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The start: There are a few options here. You can switch out EWP: Two-Blade Sword and go with something else. Like Improved Shield Bash. So you can swat/hammer your shield in instead of dancing around with a flurry of steel. That would free up a lot of coin for a sword/shield combo and possibly a heavier armor starting off.
Basically it's a two weapon fighter who can go hard (Power attack) or not. Simple and blunt.
Things to get: Keep an eye out early on for things you might not be able to fight. Swarms are the big one starting off.
Options: Like I said, instead of going with a two-sword exotic weapon fighter, you can go sword/board or two separate weapons (scimitar, short sword(s) and other one-hand/light weapons). The big points are to stock up on options that expand your role such outside of combat.
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Walking the Circle (4th level)

Kara Silverblade

Human (Varisian) fighter 4

CG Medium humanoid (human)

Init +6; Senses Perception +4

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Defense

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AC 17, touch 14, flat-footed 13 (+3 armor, +4 Dex)

hp 40 (4d10+12)

Fort +6, Ref +5, Will +3 (+1 vs. fear)

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Offense

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Speed 30 ft.

Melee two-bladed sword +7 (1d8+3/19-20) or

   two-bladed sword +5 (1d8+2/19-20), two-bladed sword +5 (1d8+2/19-20)

Ranged javelin +8 (1d6+2)

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Statistics

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Str 14, Dex 18, Con 14, Int 13, Wis 10, Cha 10

Base Atk +4; CMB +6; CMD 20

Feats Double Slice, Exotic Weapon Proficiency (two-bladed sword), Iron Will, Power Attack, Two-weapon Fighting, Weapon Focus (two-bladed sword)

Traits bully, reactionary

Skills Acrobatics +8, Climb +6, Intimidate +5, Knowledge (dungeoneering) +5, Linguistics +3, Perception +4, Perform (dance) +1, Survival +4, Swim +6

Languages Common, Kelish, Osiriani, Shoanti, Varisian

SQ armor training 1

Other Gear studded leather, javelin (4), two-bladed sword, 21 gp

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Special Abilities

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Power Attack -2/+4 You can subtract from your attack roll to add to your damage.

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Stepping up: By now the character has some teeth to her attacks with power attack, weapon focus and double slice adding to the to hit and damage. Add in iron will to help the will saves a bit. 

Things to get: A good medium armor to keep you going till you hit 7th and armor training 2. A masterwork two-bladed sword (possibly of a specific material) and a solid backup weapon. Something that might be missile or backup/different damage types. (And something for swarms, remember they don't have swarm bane clasp in core play).  Buy up a cloak of resistance. look into a belt of str/con and AC options.

Dueling through the Dance (7th level)

Kara Silverblade (Core)

Human (Varisian) fighter 7

CG Medium humanoid (human)

Init +6; Senses Perception +7

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Defense

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AC 18, touch 14, flat-footed 14 (+3 armor, +4 Dex, +1 shield)

hp 67 (7d10+21)

Fort +7, Ref +6, Will +4 (+2 vs. fear)

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Offense

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Speed 30 ft.

Melee two-bladed sword +11/+6 (1d8+6/19-20) or

   two-bladed sword +9/+4 (1d8+5/19-20), two-bladed sword +9/+4 (1d8+5/19-20)

Ranged javelin +11 (1d6+2)

Special Attacks weapon training (double +1)

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Statistics

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Str 14, Dex 18, Con 14, Int 13, Wis 10, Cha 10

Base Atk +7; CMB +9; CMD 23

Feats Double Slice, Exotic Weapon Proficiency (two-bladed sword), Improved Two-weapon Fighting, Iron Will, Power Attack, Two-weapon Defense, Two-weapon Fighting, Weapon Focus (two-bladed sword), Weapon Specialization (two-bladed sword)

Traits bully, reactionary

Skills Acrobatics +11, Climb +6, Intimidate +5, Knowledge (dungeoneering) +5, Knowledge (engineering) +5, Linguistics +7, Perception +7, Perform (dance) +2, Survival +4, Swim +6

Languages Common, Hallit, Kelish, Osiriani, Shoanti, Skald, Tien, Undercommon, Varisian

SQ armor training 2

Other Gear studded leather, javelin (4), two-bladed sword, 21 gp

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Special Abilities

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Power Attack -2/+4 You can subtract from your attack roll to add to your damage.

Two-Weapon Defense +1 to AC while wielding 2 weapons. +2 when doing so defensively.

Weapon Training (Double) +1 (Ex) +1 Attack, Damage, CMB, CMD with Double weapons

Whirling blades: By now you've got a massive full attack monster, with a good dex to help balance out the lack of shield and to buff your reflex save. Four attacks in full attack mode, weapon focus/spec to enhance your to hit and damage, and with two-weapon defense you get a bonus to AC that a non-shield fighter needs. Armor training lets you do this in full plate and finally start looking for a good AC that you'll need.
The big issue: How to build up your blade? By now, you've been the happy owner of a masterwork two-bladed sword, possibly even an adamantine one (a MERE 3,100 gp) that can hack through constructs, doors, boats, walls, and anyone that gets in your way. Of course, there is the cost for TWO WEAPONS in one. So odds are you'll never get pass +2 and most likely go with something like +1 to each end with a +1 enhancement like keen or such.

Mistress of the Bladedance (12th Level)

Kara Silverblade (Core) #4

Human (Varisian) fighter 12

CG Medium humanoid (human)

Init +7; Senses Perception +12

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Defense

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AC 20, touch 16, flat-footed 14 (+3 armor, +5 Dex, +1 dodge, +1 shield)

hp 112 (12d10+36)

Fort +10, Ref +10, Will +6 (+3 vs. fear)

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Offense

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Speed 30 ft.

Melee two-bladed sword +19/+14/+9 (1d8+9/19-20) or

   two-bladed sword +17/+12/+7 (1d8+8/19-20), two-bladed sword +17/+12/+7 (1d8+8/19-20)

Ranged javelin +18/+18 (1d6+2)

Special Attacks weapon trainings (double +2, light blades +1)

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Statistics

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Str 14, Dex 20, Con 14, Int 13, Wis 10, Cha 10

Base Atk +12; CMB +15; CMD 30

Feats Combat Expertise, Combat Reflexes, Double Slice, Exotic Weapon Proficiency (two-bladed sword), Greater Two-weapon Fighting, Greater Weapon Focus (two-bladed sword), Greater Weapon Specialization (two-bladed sword), Improved Two-weapon Fighting, Iron Will, Power Attack, Two-weapon Defense, Two-weapon Fighting, Weapon Focus (two-bladed sword), Weapon Specialization (two-bladed sword)

Traits bully, reactionary

Skills Acrobatics +17 (+29 to jump), Climb +6, Intimidate +6, Knowledge (dungeoneering) +5, Knowledge (engineering) +5, Linguistics +13, Perception +12, Perform (dance) +5, Survival +4, Swim +6

Languages Azlanti, Common, Dwarven, Elven, Hallit, Kelish, Osiriani, Shoanti, Skald, Thassilonian, Tien, Undercommon, Varisian

SQ armor training 3

Other Gear studded leather, javelin (4), two-bladed sword, 21 gp

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Special Abilities

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Combat Expertise +/-4 Bonus to AC in exchange for an equal penalty to attack.

Combat Reflexes (6 AoO/round) Can make extra attacks of opportunity/rd, and even when flat-footed.

Power Attack -4/+8 You can subtract from your attack roll to add to your damage.

Two-Weapon Defense +1 to AC while wielding 2 weapons. +2 when doing so defensively.

Weapon Training (Blades, Light) +1 (Ex) +1 Attack, Damage, CMB, CMD with Light Blades

Weapon Training (Double) +2 (Ex) +2 Attack, Damage, CMB, CMD with Double weapons

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Hurricane of steel: Now you're looking at a nasty mix of tough fighter and a blade that flies like lightning in her hands. You got 6 attacks on a full round attack and 6 attacks of opportunity a round; the trick is to get in a place where you can be in the center of things. Things like boots of haste or a friendly wizard with haste are awesome at this. A full 60 move, an extra attack from each weapon end at full BAB, and if you can get a good flanking buddy and you're 'Lady Quisinarte'. Odds are the last attack(s) won't hit a big bad buff boss type or some of the more potent elemental/planar types but 'a 20 is a 20' still applies. You've now gotten the full weapon focus/spec feat chain PLUS weapon training +2 (double weapons) for an impressive +4 to hit and damage before strength and magic bonuses. Still not going to beat out the -10 on the final attack.
Things to get. Still going to be weak on will saves, one good dominate and the caster types could be chunky salsa really quick; so odds are a cloak of resistance would be up around +3 (or higher) by now. A few scrolls (for the casters to help you out), potions (so you can do it yourself) can go a long way. Things like haste, fly, greater magic weapons for those right fights, as well as things like align weapon for those 'special' moments when a high DR laughs at your 1d8+8 (12 with power attack) attacks. Out of combat, I went with the 'translator' role I do with most martial types. You don't have a lot of skills why not pick a few 'dialects' and regional languages to help your face guy out? You're not going to be able to do a log beyond 'aid another' with your a scant languages and my standby, the pathfinder journals, aren't available in Core.
Alternative approaches: As I said in the first level section, you can have gone sword/board and mixed in a few other options. By now you could have weapon focus (x2), greater weapon focus (shield), improved shield bash and shield slam; which means you could hammer at the bad guys with your sword (or axe), and shield (keeping your AC while doing so) and occastionally slamming them back on their butt. Of course, putting magic weapon/armor pluses on the shield will make for a really expensive item, but you're also looking at a weapon that helps your AC and your fighting.