What is the worst chess piece?

To illustrate, look at this position:

Black is up a pawn, and white is "up a king", so to speak, as black's king is far from the action. White wins easily.

Any piece that is not Ctive and developed. . . .

King, he's the reason i will lose

Knight for sure!

Knights: Good in the middlegame; nearly useless in the endgame.

Bishops:  Moderately useful in the middlegame; much more useful in the endgame.

Exceptions do occur, of course.

Knight

if your talking about my least favorite king, least mobile king

Conclusion king Is the worst

all the pieces but I'd rather lose one pawn than one bisshopp

I think it's too situational to say. In terms of value and power, a pawn. But an advanced pawn is very powerful, and a queen supported by a pawn has delivered mate for me a bunch of times. Knights are awkward to work with but also important tactical pieces. Probably most of my successful fork tactics have been using a knight. And although bishops are sometimes thought of as worth a teensy bit more than a knight when considering trades, I do think learning how to defend against them is intuitively trickier. The king is very vulnerable but also incredibly useful in endgames. If I had to pick I'd say a pawn but I'm saying that even as I've encountered tons of situations this week where people have underestimated pawns and lost directly or indirectly because of it.

it depends where the picece is, a pawn could fork the king and the queen and then it would be powerful it depends

Either the king or the bishop. Especially the bishop. My case for the king not being the worst is that he's a strong endgame piece what with his attack pattern allowing him to flank most other pieces; opposition is helpful too. The bishop consistently sucks for me. The pawns and other pieces fence him in during the early game, and he can do pretty much nothing to half the squares on the board.