Princess of Atlantis
Yu-Gi-Oh! episode 163: "Self Destruction"
Kriss's parents are Dartz and Iona, who are/were the king and queen of Atlantis. Kriss was the Princess of Atlantis before the city sank beneath the ocean waves. When Dartz was overtaken by the Orichalcos, she took shelter with her grandfather Ironheart in the Realm of the Beasts. -- A few years after the Orichalcos arrived, people of Atlantis started turning into monsters, including Iona, who was then killed by Dartz. Believing people to be evil, Dartz made it his mission to wipe out the people of the city. Dartz asked Ironheart and Kriss to join him, but they both refused. In response he unleashed a number of Orichalcos Soldiers on them.
Ironheart, Kriss and Skye led a group of refugees from the city to the nearby mountains. Here Ironheart searched for the creatures of ancient power, the knights Timaeus, Critias and Helmos. Together they fought in a battle against Dartz. However neither side was victorious.
Kriss' spirit along with Ironheart and Skye's continued to live on. They met Yami Yugi, who was chosen to wield Timaeus in his card form "The Eye of Timaeus". Ironheart and Kriss saved him and Téa Gardner from the wreckage of crashed train.
Yami was unable to Summon Timaeus after he allowed Yugi's soul to be taken by playing "The Seal of Orichalcos". Ironheart and Kriss worked to help Yami overcome this. They took him to a plain of lost souls, where he faced Yugi in a Duel. Afterwards when Yugi was confronted by an Orichalcos Soldier, Kriss raced down on Skye's back to give him back the "Timaeus" card. However she is struck by one of Dartz's lightning bolts. She manages to hand Yami the card, before her spirit vanishes. An image of her is later seen on a stone marker alongside her grandfather and her pet wolf.
When the Pharaoh ultimately beats Dartz, Dartz was reunited with Kriss in the spirit realm.