The Ultimate Lifeform. In this series, Shadow is a mysterious figure who aids Mario and the gang. However, his true motives are unknown. He is a major character, aiding Mario and the gang when they most need it and providing insight to Luigi. He doesn't have much to say in these two chapters, but his role will be expanded upon, revealing what his true involvement is.

Voice:
In terms of which Shadow voice it should be closer to, best to get close to  Kirk Thorton's portrayal. Shadow has a dark and brooding voice with a hint of rasp to it. This adds a level of intimidation and mystery to the character while also increasing his "cool" factor.
Shadow's lines in Sonic Forces
Team Sonic Racing voice lines