Since there wasn't any yandere fnf I had to make some myself.

Cover art credit goes to @JukoDuko ! Ruv would be the hottest yandere and we all know it. I DEFY YOU TO DISAGREE. Also An open book plus a lovable dumbass equals a VERY emotionally unstable Ruv. B̸̤͓͓̬̰̥̯̩̬̅̐͂͂͗͗l̸̙͔͕̋́͛̿̍͠o̵̢̦͌̅ó̵̠̟͠ḑ̶̛̫͈͎̫̍̐͝ ̷̹̍̿m̴̢͇̹̺̘̩̪̞̠͎̈́̇̓̾́͆́̂͝í̷̥͖͔̈̑̈g̵̢̰̹̖̞̜̮̈́ḧ̶̡̠̘̣̦̲̤́́͌͆͝t̷̜̝̻́͌̋̑̃͐̒͗̾͝ ̴̧͖̦̣̬͑̾̌͗͋̉b̶̯͉̼͍̠̋͂̽̅̈́̇e̵̛̪͖͖̠̝̖̣͌̀̀̔̂ ̸̡̘͕̫͗͋s̸̝̺̟̣̈̈́ͅh̶̩̬̉e̴̛̛̹̔̔͆͘͠͠d̸̢̨̪͉͒́̀͋̊͊̊̉͂̈ ̵̝̞̦̯̖̈͋j̷̪͓̼̖̳̈́̎̇͑̐̒ǘ̴̥̘͈̠̺͔̱͜ś̵̨̡̙̭̫̰̠̣͊̃͐̃̕̕͝ͅṯ̶͉̞̯̘̣̞̪̎͂͑̅͊̋̈̋͝ ̶͚̼̈͝ṫ̵̞͋̑̃̊́̒͐̕͝o̶͈̘͛̀̈́̽͂͋̉ ̶͖̦͈̤̲͓͚͛͐̆̽̓̓͝á̵̠̉͑̀̎́p̸̘̞̦̞̜̭̓̍̔̂̇͜͝ͅp̷̧̛̫͙̙̮̈́̑̌́̈́̿̿͘͝e̴̛̲̬͍̬̳̲͙͕͕̞͗̊͆͑̈́̅͋̽͗á̸̢̧̨̰͉͉͓͕͜s̵̺͂̄͘è̸̢̩̫̙̬̉̓ ̶̡̙͗̑̍̈́̆͋̌́y̷̫̱̔͊̄̌̀̿'̸̛̱̦͖̖̻̀̇̉̈́̇͆̕̕a̶̲̯̙̥̳̕l̸̩̮̹̞̟̓l̴͕͓̑̀̎̊̒̃̔ͅ,̸̛̝͔͎͛͒͐̒̀̀̉̕ ̷̢̢͙̥͍̗̣͎͔̋̔̓̌̈̄̓͘ͅy̸͍̯̩̌͑͂͝͝ͅä̴̖́̃̌͆ ̶̲̘͎͈̳̼̬̥͙̞͋̇̽̾̇͊̚̚͠͝l̶͇͔̪̜̘͇̬͎̱̮̇̀́̎i̴͕̺̺̥̦̿̏̇̔̍͐̆̓̏̇ẗ̵̹̗̦̝̹̘̰̻͇̠̐t̵̨̧͍̬̲̄̈́̆͛̑̈l̵̙̏̒̓̋̽̓̀̈͌ẹ̵̢̡̪̝̞̼̟̒́̈́̄̆͐͘͜͜͠ ̷̲̱̈́̍m̸͔̝̲̞̲̬̘̳͙̌͜a̷̛̭̣͕̩͎͉̰͕͈̻͂̊͆͌͌̐̄ŝ̵̡̬͇̝̌̋͛ȏ̴̧̢̭̘̭̜͇͔͍͉̀̾̐̽c̶̻̤̳̤̩̿̽̓̽̈́̾̔͠ḧ̵̨͍̗̳͚̗͉̍̋̃́̃͘i̶̢̛͙̤͈̼̗̇̀̃̆̽̑̚s̵͈̠̙͕̬̦͚͔͆͊́̍̊͗͗̔͝ͅͅt̶̡̩̻̰͋s̶̜̗̻̥̺̯̖̽

The title says it all, I will include as many of the villains I can, if I feel there is enough information about them. I do not own these characters or this manga, credit to Horikoshi.