John-Sebastian is a talking mynah bird. He can imitate any sound.
However, although he speaks, his language is still very limited. He’s a birdbrain, who misunderstands everything. He often raises the alarm to Uncle Patrick when the kids are in trouble.

John-Sebastian is secretly jealous of the affection Marina heaps on her koala Raoul. There’s a constant stream of taunting and squabbling between them. John-Sebastian finds comfort on Uncle Patrick’s shoulder and he’d willingly lose his last feather for him.