Kyouma Mabuchi

A human Collector who has largely sworn off all Coil-related technology and has a hobby of restoring old gasoline-powered cars in a junkyard. Kyouma now works as an independent contractor who hunts down illegal Coils and those who use them. His preferred weapon are large throwing spikes.

In the past, he was the only fully human soldier in a special-ops unit Grendel which was filled with Coil technology users.
(Source: Wikipedia)