|Relatives|| Billu's Momma (Mother)|
Billu's Pappa (Father)
Bublee (Paternal Aunt)
Donster (Paternal Uncle)
|Pets|| Billu's Cat|
|Real world information|
|Appears in||Haddi Mera Buddy|
|First appearance||Meet the Reaper|
"Billu" is an idiotic but optimistic boy living in Chumpak Nagar. He is one of the three protagonists. His parents' names are not mentioned (but in the American version, they are called Gladys and Harold). He likes his friends so much that he could do anything for them. His friends names are, Haddi, Preethi, Gullu, Lallu.
Billu and Preethi were friends since babies. In the first episode, they first meet Haddi, who came to take Chitti, Billu's hamster. The duo said if Haddi wins, he would take the hamster and go away to Anotherworld but If the duo wins, they would keep Chitti for themselves, and Haddi would be their best friend forever.
Despite them being best friends, Preethi treats Billu more like a slave than a friend. However, she has shown geuine concern for Billu when he gets put in danger.
Best friend since Chitti's Birthday, Billu treats Haddi like a friend more than Preethi does.
Gullu and Billu are best buddies, Billu likes Gullu than Preethi and Haddi. Billu call Gullu as 'Glass boy' because he is wearing specs. Mohit Singh is Gullu.
Lallu is an easily scared friend of Billu. He also is liked by Billu.
In "The Grime Adventures of Billy and Mandy", the show's American version, his name is Willaim, but everyone calls him Billy.