Una bola de energía

When Avni is happy, he's a real ball of energy. But when he's sad, he can become the complete opposite: a simple, round, blue ball that doesn't speak. Then there's no one to chase after lost balls by stretching out his arms, to play the most mischievous pranks by turning red, yellow, or transparent, or to annoy the principal by taking on his appearance. Without Avni, how boring!