Kieli

Kieli, a lonely girl with the power to see ghosts, encounters a man named Harvey, who happens to be one of the legendary Undying. The Undying were soldiers made from recycled corpses that were trained to be immortal killing machines in a violent war 80 years ago. She follows Harvey on his journey to return the ghost of a soldier, who died in that war and has since been a possessing a radio, to his grave.

A nine-volume Light Novel series written by Yukako Kabei. The first novel was adapted into a two-volume Manga illustrated by Shiori Teshirogi and released in English by Yen Press. Yen Press is also publishing the novels; the first six are presently available:
 * Kieli Volume 1 - The Dead Sleep in the Wilderness
 * Kieli Volume 2 - White Wake on the Sand
 * Kieli Volume 3 - Prisoners Bound for Another Planet
 * Kieli Volume 4 - Long Night Beside a Deep Pool
 * Kieli Volume 5 - The Sunlit Garden Where it Began Part 1
 * Kieli Volume 6 - The Sunlit Garden Where it Began Part 2

This series provides examples of:
 * Belief Makes You Stupid: Kieli believes this.
 * Blessed with Suck
 * Broken Bird: Kieli.
 * Church Militant: The Undying.
 * Conveniently an Orphan: Kieli and Harvey (although he may not count because he's dead)
 * Crossing the Desert: In the second novel, White Wake on the Sand.
 * Cruel and Unusual Death: Happens all the time in this series. Every other ghost that the three meet has come to an untimely end in some really, really horrible way.
 * and later
 * Cute Ghost Girl:
 * Cursed with Awesome: The undying, being immortal and all that.
 * Dead All Along:  as well as
 * Death Seeker: Harvey, and to an extent, the Corporal.
 * Dogged Nice Guy: Julius.
 * Good Thing You Can Heal : The Undying. Especially  the list goes on an on.
 * Forgets to Eat: Harvey, mostly because he doesn't have to eat. Corporal explains it to Kieli in the first book. Although later
 * Half the Man He Used To Be: This happens to the Undying quite a bit.
 * Haunted Technology: The Corporal.
 * Heart Drive: Harvey's core gives him nearly unlimited healing powers as well as immortal "life" but if it's ever removed from his body he goes back to being well, ... dead.
 * Hoist by His Own Petard: Happened to the town of Toulouse.
 * Important Haircut: Kieli at the end of the first novel.
 * Immortality Begins At Twenty: Kieli and Becca believe Harvey is in college when they first meet him.
 * I See Dead People: Kieli.
 * The Undying can also see ghosts.
 * Light Is Not Good: The church's Undying hunting corps. The soldiers are dressed in all white armor and both Kieli and Harvey say that they remind them of demons.
 * Lonely Rich Kid: Julius
 * Mayfly-December Romance
 * Monster Clown: A rare sympathetic version, he's also a Non-Ironic Clown.
 * My Name Is Not Herbie
 * Our Zombies Are Different
 * Razor Wind: The Corporal's method of attacking.
 * Running Gag: The Corporal always tends to call Harvey by the wrong name. More specifically, "Herbie."
 * Smoking Is Cool: Harvey. Enough said.
 * The Cynic: Harvey, all the way. Although he's trying to get better.
 * The Stoic: Also Harvey, due largely from his training and the fact that he's a Shell-Shocked Veteran
 * Time Skip: Of a year and a half in the fourth novel.
 * Tranquil Fury: You do not want to make Harvey angry to the point that he gets like this.
 * Used Future
 * Walking the Earth
 * Who Wants to Live Forever?: A big theme of the series, in the beginning Harvey is basically waiting around to die. And at the end of