Jack!

Jack is a bright yellow guy with blue streaks. His body is the softest and most pliable of all. He has a fluffy, "explosive" hairstyle. The fingers on his hands are large, rounded and soft - he deliberately holds them this way to make it more pleasant to play with his friends. Because of excessive softness, parts of his body can literally fall off if he gets caught on something. Jack is incredibly cheerful, playful and childishly spontaneous. He is constantly smiling, laughing and loves to fool around (for example, sticking out his tongue). Jack is a master of sudden hugs. Kevin knows that Jack is "rubber", but he still gets scared every time Jack's body deforms.