Nostalgia. Sweet, sweet nostalgia.

Gumby's principal sidekick is Pokey, a talking pony voiced by Art Clokey and Dallas McKennon at different times, and his nemeses are the Blockheads, a pair of humanoid, red-colored figures with block-shaped heads, who wreak mischief and havoc at all times.

The Blockheads were inspired by the Katzenjammer Kids, who were always getting into scrapes and causing discomfort to others.[2]

Other characters are Gumby's dog Nopey (who responds to everything with a gloomy "nope"); Prickle, a yellow dinosaur or dragon, who often declares himself as a detective, sporting a pipe and a hat in the likeness of Sherlock Holmes; Goo, a flying blue mermaid who spits blue goo-balls and can change her physical shape at will; Gumby's mother Gumba; Gumby's father Gumbo; his sister Minga; Denali (a mastodon); Tilly (a hen); King Ott; and Professor Kapp. - Wikipedia