Harpoon Fighting Character

[Minigiant]

I need desperate help, not for the life of me can I figure a way of making a Harpoon wielding martial character reasonably effective.

The Harpoon needs Exotic Weapon Proficiency so there is that tax, but beyond that I am drawing a blank.

What ideas do you have?

[TxSam88]

I'm not seeing an issue, play a fighter, pay the feat tax and then use it just like you would any other 2-handed melee weapon, you just get a grapple check when you score a crit.

[*Khan*]

I remaked a harpoon NPC once.
The core of the build was Hamatula strike and improved grapple.
He used a Conductive Harpoon to debuff or damage futher with his supernatural abilities.