Shadow of the Valley

Shadow of the Valley by Disguise of Carnivorism is an AU next gen Death Note fanfic. Many years have passed since Light won out against all who challenged him and he is still working towards creating his utopia. Only Light isn't God, he is mortal and is beginning to feel his age... Fearing all his work will be undone upon his death, Light begins to train his heir to take over for him as Kira, and this sacred duty can only be entrusted to his own flesh and blood... (Whole series spoilers!)

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Shadow of the Valley provides examples of:

 * Abusive Parents
 * The Aloner: Light. He spends most of his time now in the graveyard talking to his favorite victims. Hikari too because her father doesn't let her out much.
 * Alternate Universe Fic
 * Apocalypse Maiden: See the ambiguous ending.
 * Bastard Understudy: Hikari
 * Calling the Old Man Out
 * Children Are Innocent
 * Children Forced to Kill: Light forces Hikari to follow in his footsteps.
 * Chronic Backstabbing Disorder: Hikari notes how Light and Ryuk have several inside jokes about all the poeple Light has betrayed.
 * Cool Old Guy: Light is still epically awesome even as a broken old man.
 * The Corrupter: Light
 * Cry for The Devil:
 * Daddy's Little Villain: Hikari
 * Darker and Edgier: yes.
 * Deadly Upgrade:
 * Distaff Counterpart: Hikari to Light.
 * Due to The Dead
 * : Light.
 * Dysfunction Junction: and how!
 * Eerie Pale-Skinned Brunette: Hikari
 * Electra Complex: "Hikari are you trying to seduce me?"
 * The Empire: The whole world follows Kira's will.
 * Evil Mentor: Light to Hikari.
 * Evil Overlord: Light.
 * Fantastic Drug: Harvested from the corpses of Kira's victims, no less.
 * Generation Xerox: this trope is played with...
 * Grandma, What Massive Hotness You Have!: Light ages quite gracefully and still looks much like he did when he was twenty but he feels worn out and used up from the subconscious burden of guilt of having ended so many lives.
 * Grave Robbing: Robbers harvest something from the corpses of Kira's victims to make drugs. Kira himself (who is only known as the crazy guy in the graveyard) tries to discourage them.
 * I Hate You Kira Dad
 * In the Blood
 * Inferred Holocaust: The ambiguous ending, any way you look at it...
 * Kid Fic: Not so cuddly though...
 * Knight Templar Parent: Light. You win the no-prize if you can guess what happens to anyone that looks at his daughter wrong.
 * Legacy Character: Kira
 * Like an Old Married Couple: Light and Ryuk.
 * Lonely At the Top: Light got everything he ever wanted that was attainable-and he is miserable.
 * Mad Dictator's Beautiful Daughter: Hikari again.
 * Name's the Same: Hikari Yagami NOT Hikari Yagami.
 * Next Gen Fic
 * Nice Job Breaking It, Hero:
 * Original Character: Hikari Yagami, Light and Misa's only child. Named Hikari (Japanese for light) by Misa, much to Light's annoyance and discomfort.
 * Overprotective Dad: Light
 * Papa Wolf
 * Patchwork Kids: Averted. Light doesn't recognize himself or Misa in Hikari and this unsettles him.
 * : Light in order to "protect" Hikari
 * Pride Before a Fall
 * Rebellious Princess: Hikari
 * Retired Monster: Light seems to have matured beyond his A God Am I kick and come to realize he's not going to last forever and if he doesn't want all of his work undone he needs a successor.
 * : Hikari
 * Shout Out: Light refers to  as the resting place of The Once and Future King.
 * Sibling Rivalry: This is why Light decides to bet it all on Hikari and not have any more children- because (in this universe) Sibling Rivalry destroyed L's successors.
 * : Hikari
 * Succession Crisis
 * Take Up My Sword: Or rather his notebook and pen.
 * Tears From a Stone: The concrete angels in the graveyard cry because Light cannot.
 * Tough Love
 * Training From Hell:
 * Tyke Bomb: Hikari, Light makes her start killing criminals when she's twelve.
 * The Vamp: Hikari starts acting out like this in order to get daddy's attention.
 * Villainous BSOD:
 * "Well Done, Son" Guy: Hikari desperately wants her father's approval.
 * Women in Refrigerators: Kira's spokespersons
 * Worthy Opponent: Light laments that out of everyone he knew L would have made the best heir for Kira. If only he didn't oppose him, the transition would have been seamless...
 * You Have Outlived Your Usefulness: