With Bucky as a kid, I imagine like big-dead eyes, constantly smiling, has literally nothing going on in his brain, has like 6 rocks in his pockets that he's gonna show his ma later. Holding hands with Steve, who is just this tiny form of mass thats constantly vibrating with anger and pent up energy, and is gnashing his jawls at you, and has his hair sticking up everywhere because as hard as the hair gel fights for its LIFE it is NOT staying down.