Lum's father, the great Oni warlord named Invader initiated the attack on Earth. An gigantic figure of a man who is very menacing and intimidating (although he doesn't seem to realize how fearsome he is). He has a weight problem and tends to raise his voice a lot. But sometimes he's kind of goofy.

As for Lum's mother, she doesn't speak a word of Japanese. The only thing you can hear from her is a jibberish-like Oni language often depicted as mah-jong tiles in the manga. Strangely enough many people don't have any trouble understanding her. She is much like an older version of Lum, she even has the same powers of electricity and flight.