The Merchant
We already have another thread ik, but this is speaking only book/Fantastic beasts screenplay canons. Here is my list
Dumbledore
Voldemort
Grindelwald
Credence (potentially rivals number 1)
Nicolas Flamel
Merlin
Godric Gryffindor
Salazar Slytherin
Rowena Ravenclaw
Helga Hufflepuff
Honorable mentions: The deathly hallow brothers if they truly created the Hallows, Death itself if the story is true (number 1 really) other school founders.
Dumbledore
Voldemort
Grindelwald
Credence (potentially rivals number 1)
Nicolas Flamel
Merlin
Godric Gryffindor
Salazar Slytherin
Rowena Ravenclaw
Helga Hufflepuff
Honorable mentions: The deathly hallow brothers if they truly created the Hallows, Death itself if the story is true (number 1 really) other school founders.