Fifi

Fifi was the pet Stigorax of Helen A.

History
When Helen was training in Gladness Academy, Fifi originally was given to Gillian H, her rival for the position of squad leader. However, Fifi quickly bonded with Helen. She sniffed out pity porn in Gillian's locker, causing her to be sent to Chuckle Camp, and Fifi was given to Helen instead. As Helen rose the ranks of the Happiness Patrol, she used Fifi to hunt and kill killjoys, including Gillian herself when she was discovered at a tragedy club. (COMIC: The Death of Fifi)

When Helen A became First Citizen on Terra Alpha, she used Fifi to hunt the Pipe People. Fifi was also fed on chocolate by Helen. Helen "decided she needed some sport" and sent her through the underground pipes of Terra Alpha pursuing Ace. Ace set an explosion which wounded Fifi. Fifi was returned to Helen and her wounds were treated and bandaged.

Helen sent Fifi back down the pipes pursuing a number of killjoys, the Seventh Doctor and Ace. She was killed when Earl Sigma caused an avalanche that crushed her. She survived long enough to get out of the pipes. She was found by Helen, who wept over her death, finally feeling sadness. (TV: The Happiness Patrol)