Balloon is highly optimistic, always viewing situations in a promising light – even when things go wrong for him, Balloon still focuses on the positives at hand. He can also act erratic and strange on occasion, making very fast movements and dancing about. When confronted with the true darkness of the world, he becomes worried and upset, but this negativity never lasts long, as he perceives his elimination from the show as a "learning opportunity".
Balloon has a highly distinct, erratic, and whimsical talking style. Balloon speaks with an overly bright, poetic, and philosophical tone, often finding a silver lining in dark situations. Interspersed with his cheerful dialogue, he randomly spouts bizarre phrases, sudden verbal bursts, and signature nonsense lines such as "shibbly hibbly hoo". His talking style mirrors his erratic physical movements. He alternates quickly between serene, floaty observations about nature or friendship and fast-paced, panicked, or confused exclamations.
Motivation is to spread joy with everyone and help them feel better
Rather than popping like a normal rubber object filled with air, it is revealed that Balloon is actually inflated with blood and internal organs. Balloon had previously made erratic jokes about having rabies and possessing a "beautiful beating heart" on the inside.
