Mr Blobby was a character on Noel Edmonds

Noel Edmonds

Noel Ernest Edmonds, is an English broadcaster and executive, who made his name as a DJ on BBC Radio 1 in the UK. He has presented many light entertainment television programmes, including Multi-Coloured Swap Shop, Top of the Pops, The Late, Late Breakfast Show, Telly Addicts, Noel's Saturday...

' Saturday night variety television show Noel's House Party

Noel's House Party

Noel's House Party was a BBC television light entertainment show hosted by Noel Edmonds that was broadcast live on Saturday evenings throughout the 1990s. It was set in a large house in the fictional village of Crinkley Bottom, leading to much innuendo. The show was broadcast during the...

, portrayed by Barry Killerby. A large pink blob, covered with yellow spots, sporting a permanent toothy grin and jiggling eyes, he communicated only by saying the word "blobby" in an electronically altered voice, expressing his moods through tone of voice and repetition.
Mr Blobby first appeared in the 'Gotcha' segment during the show's second series, in which celebrities were caught out in a Candid Camera

Candid Camera

Candid Camera is a hidden camera/practical joke reality television series created and produced by Allen Funt, which initially began on radio as Candid Microphone June 28, 1947...

 style prank.