The Sing Movie is an animated film about animals that performs on stage through their dancing and singing skills. They are like human beings because they can also talk. Here are the main characters of the movie and the real-life animals they are based.
1. Buster Moon – Male Koala

Image Sources: Sing Fandom Wiki & Fauna Focus
2. Johnny – Male Gorilla

Image Sources: Sing Fandom & Wild Life World
3. Ash – Female Porcupine

Image Sources: Sing Fandom & Shepreth Wildlife Park
4. Meena – Female Elephant

Image Sources: Sing Fandom & Elephant Hills
5. Gunter – Male Pig

Image Sources: Sing Fandom & Exporters India
6. Rosita – Female Pig

Image Sources: Sing Fandom & Dreams Time
7. Nana Noodleman – Female Black Suffolk Sheep

Image Source: Sing Fandom & Pinterest
8. Clay Calloway – Male Lion

Image Sources: Sing Fandom & Wallpaper
REFERENCES
Sing Fandom Wiki Buster Moon
Fauna Focus Male Koala
Sing Fandom Johnny
Wild Life World Male Gorilla
Sing Fandom Ash
Shepreth Wildlife Park Female Porcupine
Sing Fandom Meena
Elephant Hills Female Elephant
Sing Fandom Gunter
Exporters India Male Pig
Sing Fandom Rosita
Dreams Time Female Pig
Sing Fandom Female Black Suffolk Sheep
Pinterest Nana Noodleman
Sing Fandom Clay Calloway
Wallpaper Male Lion