Kuriboh is a fun-loving creature, much like Yugi Muto. Despite its gentle personality, Kuriboh is still useful in battles, even being willing to go up against "Blue-Eyes Ultimate Dragon". He has also defended Yugi from Obelisk in Battle City. When ever someone insults him or Yugi for his having low attack points he either becomes fierce to the point of almost charging, or becomes very melancholy.
In Ancient Egypt, after Thief Bakura attacked the Pharaoh's place, Pharaoh Atem and his priests conducted mock battles to strengthen themselves and their ka. During one training battle, Seto got his ka, Duos to mercilessly sacrifice its comrades to become more powerful. As Atem lectured Seto on how true power means never hurting your friends, Seto requested a demonstration of what he meant by power. He expected Atem to summon a God, but was surprised when he chose Kuriboh. Seto suspected he was being mocked and got Duos to destroy Kuriboh's tablet, before Kuriboh had materialized. However a Kuriboh was then summoned from each fragment of the broken tablet. They proceeded to cover Duos' sword, making it impossible for him to attack, while Atem explained that if you attack without thinking, you lose.
In Noah Kaiba's Virtual World, before Yami Yugi's Duel against Gansley, a Kuriboh made a movement, causing Yami to accidentally choose it as his Deck Master. During the battle, Kuriboh tried communicating with Yami, who could not understand at first, but Yugi realized Kuriboh was telling them to Set "Rainbow Blessing". As Yami was about to be attacked directly by "Ruklamba the Spirit King", Kuriboh used its Deck Master effect to block the attack. On his next turn, with "Kuriboh" on the field, Yami was able to use "Rainbow Blessing", allowing "Swift Gaia the Fierce Knight" to attack Gansley directly and win. After the Duel, Yami thanked Kuriboh, who smiled and faded away.