Short answers, pulled from the story.
Masahiro Ito served as both background and creature designer for the 1999 release of Silent Hill. He created many creatures from scratch and designed the environments where they lived to establish a dark atmosphere.
Silent Hill 2 launched in 2001 with Masahiro Ito serving as art director. He took charge of the overall look for both the original release and the Restless Dreams reissue while holding the specific title of drama camera designer for the third installment.
The project remained unavailable outside Japanese markets due to distribution restrictions that limited access to cell phones within Japan only. Fans could access the story through carrier networks rather than retail stores.
Unused artwork by Masahiro Ito appeared in NightCry which launched in 2016, Metal Gear Survive during its development phase in 2018, and an untitled sequel from 2013 before being cancelled. Shadows of the Damned listed him as an unused monster designer prior to its 2011 launch.
Masahiro Ito handled creature design and Otherworld design tasks for the short game Silent Hill: The Short Message released in 2024. That same year he worked on the Silent Hill 2 remake as a creature designer.