Guest Stars Bresha Webb voices Nibbles Maria Bamford voices Jill Timothy Simons voices Raccoon Maria Bamford voices Darla Nicole Byer voices Larrabee Tom Kenny voices Diablo's Human Dad David Spade voices Himself Kathleen Turner voices Nancy Phil LaMarr voices Guernico James Snyder voices Bernstein Maddie Corman voices Caravaggio Gabrielle Allan voices Mrs. Van Amburg Uncredited Will Forte voices Nathan Lisa Kudrow voices Lady Capulet