Creet
From Tardis Wiki, the free Doctor Who reference
Creet was a young Human boy who grew up on the planet of Malcassairo, waiting to fly to Utopia. He helped out at the refugee base by helping new refugees find their friends and relatives. When Martha Jones asked him what he thought Utopia would be like, he said his mother used to say " The skies are made of diamonds" (DW: Utopia)
He appears to be around 9 or 10 years of age and has long, blonde hair.
Once there, as with all the Humans, he became a Toclafane. A shared memory resulted in one Toclafane recalling Creet's ideas of Utopia. (DW: Last of the Time Lords)