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 Noah Kaiba's Virtual World, before Yami Yugi's Duel against Gansley, Kuriboh popped out of his card and made Yugi accidentally choose him 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.