"Grandfather" Uno, is the main antagonist of Operation: Z.E.R.O.. He is a demonic being who ruled the world before being overthrown by his son Monty Uno aka Numbuh 0. Many years later, he is revived by his other son and successor Father and begins transforming the people of the world into Senior Citizombies. Grandfather is very tall and lanky, and significantly taller than a normal person. He has a bald head and a large beard with long, scraggly strands of hair. Despite making only one appearance, Grandfather is the most powerful villain in the series.
Powers and Stats
Tier: At least 5-C
Name: Benedict Wigglestein Uno Sr. Grandfather
Origin: Codename: KND Operation Z.E.R.O.
Age: Unknown, at least 80 years old
Classification: Unknown, likely part human
Powers and Abilities: Superhuman Physical Characteristics, Flight, Immortality (Type 1), Age Manipulation (of anyone or anything than he touches), Pyrokinesis, Reality Manipulation, Shapeshifting, Telekinesis, Can turn people into "Senior Citizombies", who possesses superhuman abilities and can turn other peoples in zombies too
Speed: At least Massively Hypersonic movement speed (He spread his zombies across the planet in a matter of hours) with likely Relativistic attack speed via power-scaling
Lifting Strength: Unknown
Striking Strength: Unknown
Stamina: Very high
Range: Several meters with his "aging" abilities, planetary with fire manipulation via scaling
Standard Equipment: None notable
Intelligence: High. He possesses historical knowledge about the KND.
Weaknesses: Grandfather is prone to overconfidence.