KingdomheartSlayer
Fandoms
Recent works
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The Radio Demon’s Return by KingdomheartSlayer
Fandoms: Hazbin Hotel (Cartoon), Helluva Boss (Web Series)
24 Oct 2025
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Summary
After seven years in a coma-like state caused by a battle with a powerful daemon, the Radio Demon, Alastor, awakens to a world that has moved on without him. His body bears the lasting marks of the fight, leaving him vulnerable and reliant on his devoted partner, Lucifer, who saved him from death and now watches over him with unwavering protection.
Determined to reclaim his place in the infernal hierarchy, Alastor begins reviving his hotel project, carefully planning his return despite lingering injuries. The city he once ruled is now under new influences: Angel Dust has taken control of the party scene, Husk and Niffty serve him, and Vaggie has her own role in the shifting dynamics of power. As Alastor navigates this changed world, he must rely on both his cunning and Lucifer’s guardianship to confront challenges, old enemies, and new alliances.
This is a story of recovery, rivalry, and ambition, where past mistakes and future schemes collide in a city that never sleeps… and never forgives.
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Mario's Quest for the Chaos Hearts by KingdomheartSlayer
Fandoms: Super Mario Bros. (Video Games), Super Mario & Related Fandoms
29 Jun 2025
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When Luigi is kidnapped by an unknown enemy at Princess Peach's grand party, Mario sets off on a quest to find him and stop whoever is after the powerful Chaos Hearts. With the help of the Mushroom Kingdom's armies and Princess Peach herself, Mario battles his way through old foes and dangerous territory to find his brother and protect their kingdom. However, as he delves deeper into the enemy's lair, he realizes that their plans are more sinister than he ever could have imagined. Will Mario be able to rescue his brother and save the Mushroom Kingdom from this new threat?
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"The Lost Prince" is a One Piece fanfiction story that follows the journey of Zoro, who discovers that he is actually a lost prince of a kingdom. As he seeks to uncover the truth about his past and reclaim his rightful place as the kingdom's ruler, he joins forces with the Straw Hat Pirates and sets out on a series of adventures across the world of One Piece.
Throughout the story, Zoro faces many challenges and obstacles, from powerful enemies and treacherous seas to internal struggles and personal demons. But with the help of his newfound friends, he learns to overcome his fears and doubts and becomes a stronger, more skilled warrior.
Along the way, Zoro also grapples with his growing feelings for a male love interest, which adds a romantic subplot to the story. The relationship between Zoro and his love interest is portrayed with sensitivity and depth, adding an emotional layer to the adventure-filled plot.
This is set in a alternate universe where Zoro did not meet luffy and crew yet
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Welcome to the Observers Realms by KingdomheartSlayer
Fandoms: Pocket Monsters | Pokemon - All Media Types, anime - Fandom, Vtubers
19 Mar 2023
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Summary
HI i am Cosmos Slayer i am new to the business, but come join me on my adventure across games and anime also cartoons first place i am going to be fun cant wait for more adventure!
- Language:
- English
- Words:
- 873
- Chapters:
- 1/1
- Kudos:
- 1
- Hits:
- 17
Recent bookmarks
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Summary
Vox is gone for good, a new status quo is forming, but not everyone is going to take the change lightly....
Series
- Part 14 of Silenced
Bookmarked by KingdomheartSlayer
04 May 2026
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Summary
Vox is on the verge of achieving full victory with few that can stop him: Charlie and Alastor are his prisoners and Lucifer has been blackmailed into submission. Michael has a plan, but it is a risky one.
One that requires Alastor to 'die'...
But Alastor awakening to his full potential may just make him a greater threat to everyone than Vox ever was....
Series
- Part 13 of Silenced
Bookmarked by KingdomheartSlayer
04 May 2026
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Raising Hell (AdamsApple) by PaintToxic
Fandoms: Hazbin Hotel (Cartoon), Helluva Boss (Web Series)
28 Apr 2026
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Summary
After everything they faced, Lucifer and Adam thought the hardest part was over.
Then Charlotte came into their lives.
And they discovered their world could be filled with colors they never expected to find in Hell — pastel and bittersweet, chaotic and perfect.
Season two of "The First Sin."
Hope you enjoy it ✧˖°Bookmarked by KingdomheartSlayer
04 May 2026
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The First Sin [AdamsApple] by PaintToxic
Fandoms: Hazbin Hotel (Cartoon), Helluva Boss (Web Series)
05 Mar 2026
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Summary
Lucifer and Adam defy destiny by choosing love over duty and free will over obedience. Their expulsion from paradise is not an ending, but the beginning of a journey marked by loss, passion, and rebellion. Together, they must face a hostile world while redefining what family, home, and redemption mean in the darkest corners of creation.
This is a “what if” fanfic where Lucifer falls in love with Adam instead of Lilith.
The story will have a second season, currently in production.
Additionally, the most up-to-date version is available in Spanish on my Wattpad under the name Hero_DkBk.Bookmarked by KingdomheartSlayer
03 May 2026
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The Piper of Hell by Pinkdiosma
Fandoms: Hazbin Hotel (Cartoon), Hellaverse | Hazbin Hotel & Helluva Boss Universe, Hazbin Hotel (Cartoon) RPF
05 May 2026
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Summary
When Lilith abandons Hell, leaving behind her husband and their four-year-old daughter, King Lucifer sinks into a consuming depression. Unable to be the father Charlie needs, it is Alastor — the Radio Demon and the king's right hand — who takes on the care of the little princess.
Between magical stories and adventures with her small friends, Charlie finds in Alastor the figure her father cannot be. But when the tensions between the fallen king and his servant finally erupt, ancient secrets threaten to come to light, and a broken promise could change Hell forever.
Bookmarked by KingdomheartSlayer
01 May 2026