Presenting brand new Character (The Classic version):
Alter Nightmare Balloon Toad, from:

Five Nights at Sonic's 4 DLC: Different Dimension /

Five Nights at Sonic's: Mega Merge Max Mix (Alternative Maniac Mania)

Later, he will change into (The Modern Version):
Nightmare Mechano Balloon Toad, and appears in:

Five Nights at Sonic's 4 DLC: Insane Immerse /

Five Nights at Sonic's: Fierce Forces