EDIT 1: Fixed a couple of mistakes
This is the fusion chart for Shin Megami Tensei IV.
I used my own game to collect all of the data, so it should be correct, but if there is something missing, please tell.
I did not include the DLC-only classes, as I do not have the complete information on their fusions.
The coloring and borders for the Primes just are there to tell you what they are.
The ones without borders are the lower-level Primes like Aeros and the ones with borders are the higher ones, like Sylph.