It's mainly as a defense rather than just that. The idea is that no living thing can hide from him in any form. Even assassins have a hard time killing him. Still, I'm just throwing ideas out there to get an general understanding of it myself. The more I read it, the more I understand it. At least that's the goal.

Here's what I've got for it so far. As it looks so far, I might just end up getting rid of it which will be no trouble.

Devil Fruit(if any): Sukyansukyan nomi (Scan Scan)[I know it sounds retarded]
Abilities: Has the ability to see life-force of other living things
Down-sides: Obviously, can’t swim.
	 : Can only use the sight for about 20 minutes before problems begin; Any longer, and he begins to lose his sight for an extended period of time, up to three days at a time.
	 : Can’t see any living object in the ocean; Pools are different, as they try not to use sea water in most pools.
 : Only spreads to 30 meter radius.
 : Can’t determine exact distance of every life-force yet.
BTW, I used google translate for the name. It's still stupid.