Maria Berenyi had just completed her PHD in Entomology and was set to become an assistant professor in the subject. She drafted into government service due to her specialty, insects, and was soon working on top secret research against the Kazoops. She is appointed as the government supervisor of the human / animal project and becomes the main liaison with Grzzt. Herbert was just another spoiled dachshund until the Grzzt universal communications chip came into the picture.

Nina Chung is the put-upon oldest daughter of an immigrant Korean family. She joined the Home Guard despite her parent's wishes, and has become more assertive as a result of service, leading to tension at home. Sun-Tzu is a Bengal Tiger with an alpha personality who choose Nina as his partner & has pretty much taken over the Chung household.

Martha Cortez was born in East LA to a teenage mother who got knocked up by a gang banger. Martha's childhood was deprived, as her father spent most of it in jail, while her mother became a junkie. Martha had fallen into that pattern as well, becoming the teenage parent to twin boys. Her life changed when the Kazoops killed her boys and Martha enlisted in the Home Guard for revenge. Che is her doberman pinscher.

Pepe Gomez is a skate rat from the wrong side of the tracks in Riverside, CA. Unlike most of the guys from his block, he went to college and graduated. During his college days, he was the chapter president of his fraternity and helped initiate his future squad mate, Nate Josephson. They are friends to this day. Pepe had settled into an office serf existence long separated from his 'hood when the Kazoops invaded. Willy had been living at the edge of the Los Angeles Zoo (easier opportunities for scavenging) when he was spotted shadowing the special squad. He was offered membership and accepted. Willy is having a hard time adjusting to living as a domesticated canine though.

Pamela Greenberg is a Beverly Hills JAP (Jewish American Princess) who had just become engaged to be married to a Jewish doctor (thrilling her parents). During their wedding reception, a Kazoop ship strafed their party and her new husband was killed. While her parents and in-laws mourned, Pamela joined the Home Guard. Her cat Cleopatra was a spoiled Siamese before the Kazoop invasion, who has now become quite adept at sneaking around and surprising prey.

Nate Josephson was a college graduate working in a cubicle when the Kazoop invasion began. He joined the Home Guard, patrolling his area with his dog, Chopper. He was leading the patrol that came up the alien defector, Grzzt.

Kevin Keene is an actor who's career was poised to take off when the Kazoops attacked (he was filming the pilot of his first TV show). Kevin had come to Hollywood from a small Iowa farm town, leaving behind his high school sweetheart, Carol Anne. Kevin has cut quite a swath through his female co-stars. His ferrets had been given to him in lieu of pay when he did an equity waiver play and are constantly looking for something to eat.

Darryl Washington was a promising college football player when the alien invasion happened. Darryl's plan to go pro and get his grandparents out of the project they live in went by the wayside as he enlisted in the Home Guard. Leon was in the LA Zoo when he recruited to be part of the first mixed squadron to fight against the invaders. Leon has a carefree attitude and enjoys hunting and killing enemies and prey.