Gobo is designated as the Moon Greeter.
The Moon Greeter is the Fraggle who welcomes the Fraggle Moon each month. Every Fraggle gets a chance to greet the Fraggle Moon, which is considered the most beautiful thing in all Fraggledom, in his or her own way.
In a first-season episode of Fraggle Rock, "Capture the Moon", Gobo Fraggle is the designated Moon Greeter.