This art has some references to Katana Zero's poster

war correspondent Paci Perkins

PTTR

Otis Zombie

GARGANTUAR FREEMAN

Creating a Half-Life barnacle in RPG Maker without the need for a script is not an easy task.

Gman yeti

Attack animation

Ｕｎｉｔｅｄ Ｓｔａｔｅｓ ｏｆ Ｄｉａｖｏｌｏ

Many parts of the United States of Diavolo were designed with reference to City 17 in Half Life 2 Beta