He is a large monster covered in red fur and long arms with dirty yellow claws and wears tennis shoes.
He is 9 years old in The Looney Tunes Show and the adoptive son of Witch Hazel who hates Daffy Duck. Unlike his mother, he loves Daffy Duck and he has a kid voice in The Looney Tunes Show when he reprises the songs of "I Love to Singa!" from 1936 shows and "September in Rain" made by singers including an owl with jazz skills. When in Duck Dodgers episode of Looney Tunes, he resides in the giant egg in his house, he was shaved by Porky Pig with scissors for monsters.
In an episode of Looney Tunes when he was an adult, he was nicknamed Rudolph by the mad genius to have an invented hair that Bugs Bunny pretends to be a beautician, he was shrunken down to mouse size and kicks the mouse out of the mouse hole, he has then a high-pitched voice.
In The Looney Tunes Show, Gossamer is a child of 9 years old with a small kid voice, he likes Daffy Duck, he loves to sing a song like "I love to Singa!" to attract Granny, Sylvester Sr., Tweety Bird and the Looney Tunes characters, in the episode, he sings "September in Rain" to attract his friend including Daffy Duck and Bugs Bunny.