Dunkey plays some M rated games (GTA series, Death Stranding, Mortal Kombat, etc. which may contain strong violence and gore.
In some videos, Dunkey makes death threats and even sometimes hopes a character will die. This is purely meant to be comical.
In some videos, example: "Extreme Mario Maker", Dunkey pretends to commit suicide. At the end of the video, an audible gun shot and the body collapsing can be heard.
In the song, "I'm Going To Kill You", Dunkey says he'll "spend all your money on crack and die".
Death including suicide is reflected in some videos but purely meant to be comical.
The song "I'm Going To Kill You" threatens the viewer with many implications of murder via stabbing, drowning, shooting, decapitation, melting, etc. but it's purely meant to be comical.