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He was born in Northport, New York and was raised in Long Island. He has a brother and 2 sisters, one of which is Alison Fanelli. He is also diagnosed with Asperger syndrome.
Niosi attended the School of Visual Arts in New York City. Like most animators, he uploaded a bunch of animations on Newgrounds which he joined in 2004. He was known on the site as "Kibopher". His first professional job was for Eduware, providing character design and voices. He has also worked on the animation of a few games, notably, A Hat In Time and Skullgirls.
A major project he worked on was the web series, 'Terrain of Magical Expertise which he co-created with Mike Luckas. It was crowdfunded through GoFundMe and was released on Newgrounds on November 11, 2011 and ended on July 7, 2015. A video game adaptation, funded through Kickstarter and produced by NEO-C Productions LLC., was released on 2017.
As a voice actor, his first professional role was in Pokémon: Diamond and Pearl - Galactic Battles which he got after meeting Tom Wayland. Throughout the rest of the decade, he voiced several animé characters which includes Arataka Reigen in Mob Psycho 100 and Pegasus in the Viz Media dub of Sailor Moon: SuperS. He was also in several cartoons and games.