Private Baldrick is a private in a First World War trench, serving under Captain Blackadder and Lieutenant George, and he's the platoon's cook. His hero is Lord Flashheart.
Equal in foulness to the third Baldrick, Private Baldrick also matches his immediate predecessor in terms of stupidity. His "cunning plans" verge on those of an insane person. Examples include carving his name on a bullet, in relation to the old saying "a bullet with your name on it", his explanation being that if he owns the bullet, it won't ever kill him as he won't ever shoot himself ('shame' comments Captain Blackadder), and the chances of there being two bullets with "Baldrick" on them are "very small indeed". and he has also been known to eat cigarettes as seen in the last episode of the series.