Lum's father, also known as Mr. Invader, is a large, pudgy oni alien who leads the invasion of Earth at the beginning of the series. He serves as the figurehead of the Oni race's challenge to humanity, initiating the game of tag that determines the planet's fate. His background is that of a warlord and the patriarch of the Oniboshi royal family, which gives him a commanding presence. In terms of personality, he is loud, boisterous, and often appears menacing, but he does not always realize how fearsome he looks. He tends to raise his voice and can be intimidating, yet he also has a goofy side that emerges in everyday situations. His motivations are generally aligned with his role as an invader and a father: he wants to secure victory for his people and ensure his daughter Lum's happiness, though his methods are often overbearing. Within the story, he appears as a supporting character, most prominently at the start of the series and in occasional later episodes and films. His key relationships include his daughter Lum, whom he clearly cares for, and his wife, who is notably domineering and often puts him in his place. He is genuinely afraid of his wife, mirroring the dynamic between Ataru and Lum. In terms of development, he remains largely static throughout the series, with no major character arc. His notable abilities are those typical of an oni: he possesses superhuman strength and durability, and he can generate powerful electrical discharges like his daughter. Despite his fearsome appearance, he is often the butt of comedic situations, especially when his wife or daughter overrules him.