His videos can be a bit violent to little kids. Blood and violence is common in his new videos. But it's mostly TV-14 at worst.
People die/injure themselves or by someone in various ways, whether it's getting chopped like sushi, beaten up to death, ( slapped and squished ), crushed, roll down... no matter which one, all will be bloodly as hell.
In The videos Pain, I Almost died (3 times), my brother almost died (18 times) do have a lot of violence and blood.
Violence isn't frequent, ( sorta ), but in episodes that revolve around the subject of pain, there will be a lot of horrible acts.
Bryson beats people up and/or kills them for little reason a lot of times, but it is cartoonish and played for laughs most of the time.
In "My Bully Brother", as a joke, Brayden pulls out his heart with lots of blood surrounding it. But this is brief and only lasts a couple of seconds.