So when I built my Bladebound Kensai I was tired of all the Dervish Dance builds, so I went for a Strength-based character. It was a little fragile at first level, but wound up being highly effective.
Human: Str 17, Dex 14, Con 12, Int 16, Wis 10, Cha 7.
1: Nemesis, Arcane Strike, Weapon Focus (Katana)
3: Power Attack
5: Furious Focus, Intensified Spell
That foundation nets you high damage at all levels, and the damage will just keep scaling up. The Nemesis story feat will allow you to pick up both an Extra HP and a 1/4 or an Arcane Point each level. It can also potentially net you another +2 to Strength at some point in the story.
2-Handed Arcane Strike Power Attacks will be quite powerful when you can deliver them and by level 5 you'll be able to add Keen to your sword for free, allowing for a good number of crits.
The first couple of levels will be rough due to your low AC. I recommend buying either potions of Mage Armor or a 10 charge wand of Mage Armor. Picking up Mage Armor through an Arcana at level 6 is recommended.
Early gear purchases should be level 1 Pearls of Power and you should plan on grabbing some level 2 Pearls at higher levels. This gives you quite a lot of spells to cast each day.