Who are these children's characters?

These are the four Teletubbies: Tinky Winky, Laa-Laa, Po and Dipsy (from left to right).

'Teletubbies' is a British children's television series that first aired from 1997-2001 and was later revived in 2015-present. The show's four main characters were the Teletubbies, so called because of the television screen in their stomachs and antennas on their heads. Designed to resemble toddlers, they are brightly multi-coloured and speak in gibberish.

The show's episode structure is very formulaic. Each episode the Teletubbies interact with the show's supporting characters, footage of live children is shown on their television screens and a magical event happens. At the end of each episode, the Teletubbies reluctantly say goodbye to the viewer as they go back to their home while the Sun Baby sets.

The Voice Trumpets (periscope-like speakers that rise from the ground) and Noo-noo (a mishap-prone anthropomorphic blue vacuum cleaner) were the original supporting characters but the revived series later added The Tubby Phone and the Tiddlytubbies (baby Teletubbies) to the roster.

'Teletubbies' was created by Anne Wood and Andrew Davenport for the BBC. As of 2019, 16 seasons have been produced. The show is a commercial and critical success (winning multiple BAFTA awards and being nominated for two Daytime Emmys), but has received some criticism for the educational value of the gibberish speak used by the Teletubbies as opposed to full sentences.