Chimera Children

Disclaimer:
I do not own the characters or the series and games.
It is an au world starring with:
Undertale
Deltarune
Poppy Playtime
Five Nights at Freddy's
The Freak Circus
Hollow Knight
Sky Children
Pocket Mirror
In this au, Columbina is alive and the characters of Five Nights at Freddy's are females.

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The story begins where a young man named Fran who is a college student and a part-time detective lives with his siblings. A young teenager named Kris, and a little girl named Frisk. The three of them lived peaceful at a place called Echo Town which is paradise for Monsters and Humans living together.
Until they met a hybrid called Seeker, telling them the world has yet to tell its secrets and a dark force was rising.
Now the three siblings must uncover the secrets, save and guide the lost souls, and defeat the evil who wishes cause chaos and destruction once more.