|Character of Upin & Ipin|
| Nur Fathiah Diaz (season 1-3)|
Asyiela Putri (season 4-now)
Upin and Ipin are agreeable twin brothers and are both bald-headed. Upin is different from Ipin because of Upin's hair that stands out on his bald head and often wears a yellow tank top that is printed with the letter "U".
Upin talks a lot in the series. As an older brother, Upin shows leadership to Ipin; He plans and tries to find better ways to do things. When Upin is not being naughty he corrects the mistakes of his brother. Upin and Ipin are rarely far apart, indicating that they need each other.
|Upin | Ipin | Ros | Opah | Tok Dalang | Mei Mei | Jarjit | Ehsan | Fizi | Mail | Susanti | Dzul | Ijat | Devi | Jasmin | Muthu | Salleh | Rembo | Ah Tong | Sapy | Apin | Rajoo | Oopet | Pak Mail | Singh | Nurul | Nurul binti Ahmad | Tiger | Melati | Hamzah|