Here is a list of fanfics by when they occur in the Castlevania timeline.
Leon Belmont Era Fan Fics[]
Pre-Lament of Innocense[]
Accursed Fate - just prior to Elizabetha's death
During Lament of Innocense[]
Post-Lament of Innocense[]
Castlevania: Children of the Moonlight - Leon's young daughter's quest
Trevor Belmont Era Fan Fics[]
Pre-Legends[]
During Legends[]
Between Legends and Dracula's Curse[]
During Dracula's Curse[]
Between Dracula's Curse and Curse of Darkness[]
During Curse of Darkness[]
Not to be Left Out - starts while Julia is tending to Trevor's wounds.
After Curse of Darkness[]
Christopher Belmont Era Fan Fics[]
Simon Belmont Era Fan Fics[]
Richter Belmont Era Fan Fics[]
Because of You - shortly after the birth of Maria's daughter
Ecclesia Era Fan Fics[]
Pre-Order of Ecclesia[]
Order of Ecclesia Fan Fics[]
Words Left Unsaid - Dracula remembers Lisa's words before the final battle with Shanoa.
Post Order of Ecclesia Fan Fics[]
Schneider and Graves Era Fan Fics[]
Morris Era Fan Fics[]
Julius Belmont Era Fan Fics[]
Demon Castle Wars[]
Castlevania Tales: 20th Anniversary Special - An accident causes all of time to unravel (main plot time period)
Pre-Aria of Sorrow[]
Castlevania: Rondo of Shadows - Takes place in 2012, the story explains that Dracula's soul was scattered around the planet.
Between Aria of Sorrow and Dawn of Sorrow[]
Post-Dawn of Sorrow[]
Sonata of Memories - Soma is a college student now.