This Chess Soldier is from a visual novel called Lost Alice.

The Chess Soldiers work under King Owen, and they are said to be "speaking in an unnatural way." When this soldier appears in Joker's route, he only speaks to Alice, ignoring Joker as if he weren't even there to begin with. Alice then suggests that the soldier is being rude. When Alice speaks out against the king, the soldiers get angry and offended, then start attacking her partner verbally. They are very loyal to the King, and will not hesitate to harm those who speak out against the King, as they will do his every bidding.

Voice: Gruff, deep, and intimidating