Sunil is a very crafty mongoose who loves magic. He is often shown to practice or may use it when it would come in handy. However, he's also very cowardly and even admits this as his most common of all faults. The others care deeply about him and he knows this, but sometimes it isn't enough to make him face his fears or worries.
Sunil panics very easily, but when cobras come up (real or imaginary), he strangely turns very strong and competent and is able to do the job right. Blythe and Russell use his natural hatred of cobras to give him the confidence to help rescue the remaining pets (Zoe, Minka, Penny Ling, Pepper and Vinnie) from their imprisonment within the Largest Ever Pet Shop.
- During the fashion show in Blythe's Big Adventure Part Two, Sunil wore a cute purple themed raincoat and hat, both of which had lines of blue detailing on them. He also had an umbrella that was blue with small clouds all over it.
- Rescue misson outfit in Gailbreak!
- A dark gray beret with a red tie in Bad Hair Day.
- His magician hat and cape in Lights, Camera, Mongoose!
- Star Trek outfit in Sweet (Truck) Ride.
- Scottish outfit in Helicopter Dad.
- Nurse outfit in the song Humanarian, which was in the episode What Did You Say?
- In Frenemies, he wears a lilac dress and matching tiara.
Rivalry with Kaa
- Despite being an Indian oriented character, Sunil's species is depicted as a banded mongoose, which is actually an African subspecies.
- Sunil's hatred of cobras is most likely due to the fact that snakes and mongoose are enemies that often fight each other.
- Sunil has been able to hypnotize people, as shown in Gailbreak!.
- Sunil's name means "deep or very dark blue" in Hindi, while Nevla means Mongoose. So Sunil Nevla means Dark Blue Mongoose.
- His parents have appeared in Frenemies, it was also mentioned that they had wanted him to study medicine.
- Despite Sunil routinely having success with magic, his abilities and knowledge of magic are often ridiculed by the other pets.
- It's shown in Eight Arms to Hold You that he lives in an apartment in the third floor of the same building as Littlest Pet Shop. According to Julie McNally Cahill, with the Indian Nevla family
- Sunil is voiced by Peter New, who also voices Big McIntosh, Rarity's father, Caramel, Half Baked Apple, and Goldie Delicious
- Sunil may hate cobras, but he accepts Rattlesnake Jake and Rattler, and friends.
- Sunil is also an arch rival with Kaa.
- Sunil will meet the FT Squad in The FT Squad Goes to Littlest Pet Shop.
- Sunil will meet Team Robot in Emerl's Adventure's of Thomas & Friends: The Adventure Begins.
- Sunil will meet meet Thomas, Twilight Sparkle, and their friends in Thomas and Twilight Sparkle's Adventures of Littlest Pet Shop: Blythe's Big Adventure.
- Sunil guest stars in Brian Griffin's Adventures of Planes, Thomas and Twilight Sparkle's Adventures of Planes: Fire & Rescue, Thomas and Twilight Sparkle's Adventures of King Kong, Thomas and Twilight Sparkle's Adventures of The Terminator, Thomas and Twilight Sparkle's Adventures of The Terminator II: Judgment Day, Thomas and Twilight Sparkle's Adventures of The Terminator III: Rise of the Machines, Thomas, Twilight Sparkle and The Chronicles of Narnia: The Lion, The Witch, and The Wardrobe, Thomas, Twilight Sparkle and The Chronicles of Narnia: Prince Caspian, Thomas and Twilight's Adventure with Jimmy Neutron: Boy Genius and Thomas and Twilight Sparkle meet Shrek.