Making Riddick

[Segial]

Human, High Dex, High Int, good stats in Strength and Constitution

Fighter 4/Swaschbuckler 3/ Ranger 3/ Invisible Blade 10

Fighter for Weapon Focus (Dagger), Weapon Specialisation (Dagger), good HP and a good Fort Save.

Ranger gives you Track, Endurance and Two-Weapon-Fighting, Favored Enemy (Human), a bunch of skillpoints as well as two good saves.

Swashbuckler for Weapon Finess, INT-based Damage, and access to bluff and sense motive for the Invisible Blade class.

Invisible Blade for free feints and overall superior dagger pwnage.

Use the remaining feats for dagger and/or two-weapon fighting feats.

That build give you at least half a dozen attacks with a full round attack with a BAB of 20, free feints, nasty dagger sneak damage, good hitpoints, good AC and good fort and excellent reflex saves. Happy? :)