Blister was an elderly mole whom Fee befriended at the nursing home. He dies in the episode "Later, Dingus".
In his first appearance, he is an old man brown mole wearing a violet-tattered coat with a lavender tank top, dark green pajamas and a slipper. He also wear a pair of old glasses. He also had a heart-shaped tatoo on his left arm with the name "Meryl".