He is the youngest son of veteran action star Renato del Prado and actress Amelia Robles.
His mother refused to use his father's influence in the industry to get in so she trained him herself and his other two siblings to act and regularly brings them to auditions.
Despite the popular belief that he was a member of 1992 variety/gag show Ang TV, he was not.
Some of his movies are Pulis Probinsya, Pulis Probinsya 2, Magic Kingdom: Ang Alamat ng Damortis, One More Chance, Catch Me, I'm in Love, Pagpag: Siyam na Buhay, A Second Chance, How to Be Yours, and TV shows are G-mik, Qpids, Lobo, Batang X, Green Rose, Bridges of Love, The Story of Us, Ang Bagong Pamilya ni Ponching, to name a few.
Following the closure of ABS-CBN Channel 2 on May 5, 2020, Janus returned to GMA Channel 7 for his comeback kapuso project after his last GMA 7 show was a youth oriented drama series Hanggang Kailan in 2004, and also his 1st sitcom entitled Happy Together with fellow matinee idol and actor John Lloyd Cruz, former Goin Bulilit actors Miles Ocampo & Vito Quizon, former Dick & Carmi Host Carmi Martin, former PBB Housemate Jayson Gainza, former Your Face Sounds Familiar Philippines Contestant Eric Nicholas, model & comedian Ashley Rivera, actress Jenzel Angeles, former Kalokalike Contestant Wally Waley, and former Banana Split cast member comedian host Kuya Jobert Austria.