Gaignun Kukai Jr.

Gaignun Kukai Jr., originally known as Rubedo , is a playable character in the Xenosaga series.

History
Junior is one of the few remaining U.R.T.V.s. He was a designer child specifically designed along with the other U.R.T.V.s to be an anti-thesis to U-DO. While being the age of an adult, he has the physical size of a child, in contrast to the other still living U.R.T.V.s. Official records have him as the adopted son of Gaignun Kukai and have him as born in the year T.C. 4755 instead of his actual birth year of 4740.

Episode I
Junior first appears investigating the disappearance of Ariadne and the destroyed Woglinde via his ship the Durandal. The Durandal is come upon by a U-TIC Battleship and the two do battle, with the Durandal coming out on top. Junior heads inside the battleship along with colleague Mary and an unnamed soldier to investigate further but are unable to come away with the enemy mainframe information they seek after it is destroyed by U-TIC soldiers.

Investigating the Zohar Emulator, Junior ends up bringing the Durandal to the region of space where the Cathedral Ship is and is able to recover the Elsa and the party members occupying it. Shion and the others head to the bridge to meet him. Junior takes everyone back to the Kukai Foundation. Along the way, Junior brings Shion and the others to a large chamber in the Durandal where they are storing the Zohar Emulators, as well as humans who have started turning into gnosis. Junior explains the origin of the Kukai Foundation to the party. Later, Junior is seen talking to Gaignun about KOS-MOS and Shion. Junior also sounds concerned for MOMO. Gaignun gives him a gift, a Makarov gun. Junior hopes to cheer up Shion as well and invites her and the others to the beach within the Kukai Foundation. Shion wonders about Junior and Gaignun's relationship and if they are brothers, father and son or clones of each other. Thinking they may split up from each other in the near future, Junior provides MOMO with a bracelet keepsake.

When the Kukai Foundation is framed by the U-TIC Organization for destroying the Woglinde, Junior is arrested along with the other party members and speculates that this is occurring due to the rights and legal privileges that Second Miltia has been invested with. When the party heads into the Encephalon within KOS-MOS to try and prove their innocence, Junior is brought along with Ziggy and MOMO to the streets of Old Miltia where he sees other infected U.R.T.V.s walking by who start firing. He sees a young Gaignun searching for him. Junion also has a vision of himself saving a young Gaignun from a young Albedo. Junior later has a vision of Albedo in a crazed state.

When a massive amount of gnosis starts appearing Junior orders all the civilians of the Kukai Foundation to head aboard the Durandal. When MOMO disappears and the Song of Nephilim appears, Junior starts having a bad feeling as if he's being dragged into an abyss. Junior feels Albedo's presence and orders the Elsa to head to the Song of Nephilim. He and Ziggy argue over who is going to rescue MOMO but head there together, with him warning the others about Albedo. Junior still feels that this is his responsibility on his own after entering but the other party members accompany him. They come across Albedo, who is holding MOMO and a Kirschwasser who was taking on MOMO's appearance tries to strangle him. Junior unleashes his power to get her off of him and grows more frustrated with Albeodo, shooting at him and unleashing his power again. This merely knocks Albedo away from MOMO but doesn't harm him. Albedo and Junior's power grows stronger, but MOMO is able to break them up. With the appearance of the Blue Testament, Albedo is able to escape but Junior and the others recover MOMO.

Albedo taunts Junior as he resurrects the Proto Merkabah. Junior and the others head into Proto Merkabah in order to stop him. At the core of Proto Merkabah Junior questions Albedo on why he is doing what he's doing. Albedo claims to be doing it for Junior's sake and asks if he has forgotten what he did to him and the other U.R.T.V.s when he severed the mental link to them 14 years prior causing them to succumb to the Song of Nephilim. Junior admits to not being able to control his fear. Albedo departs, forcing Junior and the others to defeat the gnosis formed with the reactor. Junior escapes along with the others to the Elsa which makes its way to Second Miltia.