[1] Soo is an intelligent, calm and collected female panda who acts as the foil for both Sooty and Sweep.

Brenda Longman continued to play the character away from the TV series and in 2002 featured as Soo's voice in some McDonald's Happy Meals adverts.

In 1991, Soo along with many other puppets appeared in the 1991 Comic Relief music video Helping Hand.

In her appearance on The Weakest Link, it is revealed that she owns a pair of wellingtons and wore them to the show.

On 30 September 2008, Brenda Longman, assisted by Soo, appeared on BBC One's Bargain Hunt, buying antiques at London's Portobello Road Market and then selling them at Bellmans Auction House in Sussex.