Character's name: "Grim (voice)"
Birthday: 10/28/1970
Birthplace: Milwaukee, Wisconsin, USA
Biography:
Gregory D. Eagles (born October 28, 1970) is an American actor, voice actor, writer and producer. He is best known for voicing the Grim Reaper in Grim & Evil and its spin-off The Grim Adventures of Billy & Mandy. He is also known for voicing Brother 6 and Rokutaro in Afro Samurai, Aku Aku in the Crash Bandicoot video game franchise, and Gray Fox in Metal Gear Solid.

Character's name: "Billy (voice)"
Birthday: 07/29/1966
Birthplace: Van Nuys, California, USA
Biography:
Richard Steven Horvitz (born July 29, 1966) is an American actor and comedian, best known for his voice work in animation and video games. His voice credits include the original Alpha 5 on Mighty Morphin Power Rangers, Power Rangers Zeo and Power Rangers Turbo, Razputin in Psychonauts, Kaos in Skylanders, Billy and his father Harold in Grim & Evil and The Grim Adventures of Billy & Mandy, Grey Matter in Ben 10, Rodney in Squirrel Boy, Daggett in The Angry Beavers, Zim in Invader Zim, Orthopox in Destroy All Humans!, the Zoni in Ratchet & Clank, Bumble in Kinectimals, the Space Weaver in Broken Age, Kanchomé in Zatch Bell!, and Moxxie in Helluva Boss.

Character's name: "Mandy (voice)"
Birthday: 08/24/1973
Birthplace: Fort Ord, California, USA
Biography:
Grey DeLisle (born August 24, 1973), sometimes credited as Grey Griffin, is an American voice actress, comedian and singer-songwriter. DeLisle is known for various roles in animated productions and video games. On September 27, 2018, she released her debut comedy act, titled "My First Comedy Special". On November 10, 2019, The Simpsons producers announced that DeLisle would replace Russi Taylor as the voice of Martin Prince and Sherri and Terri, after Taylor's death in July 2019.

Character's name: "Irwin (voice)"
Birthday: 10/19/1969
Birthplace: Los Angeles, California, USA
Biography:
Vanessa Marshall (born October 19, 1969 in Los Angeles, California, U.S.) is an American voice and television actress who is most active in films, cartoons and video games. She is the daughter of actress Joan Van Ark and reporter John Marshall.