Caius Ballad

a character

Caius (カイアス, Kaiasu) is the main antagonist in Final Fantasy XIII-2. He is said to act as Lightning's rival. He is depicted in the game's logo with her.

Appearance and Personality
Caius has long, dark purple hair adorned with feathers and tribal beads, and wears a long, purple bandanna. He wears form-fitting black and purple armor that bears a strong resemblance to Bahamut, or his Eidolon, Chaos Bahamut. He carries a large sword with an eye on the hilt that emanates a purple flame after it opens.

Story
Toriyama has described Caius as being of equal strength to Lightning, and being able to fight on even terms with her. He is said to be on a similar mission to Lightning's, and will be in her way as she tries to complete her own. Toriyama has also said that Caius has a relationship with Lightning as her fated rival, and is somehow also connected to Noel Kreiss. He has been revealed to also come from the future, and be an important figure in Noel's past and Serah's future. In the game's first trailer, Caius was shown crossing swords with Lightning in Valhalla. In the PAX trailer, Caius smirks with a smug look on his face and turns towards Valhalla.

In the TGS 2011 trailer, he appears in front of Noel and Serah in Oerba, with his female companion, a veiled woman named Paddra Nsu-Yeul, saying she has been watching over them. Caius tells Noel that he will pay for his crimes with blood. The Xbox 360 TGS trailer shows Caius and Yeul traveling together, interacting with Noel and Serah. In the Sunleth Waterscape, Caius and Yeul stand in front of a time gate, and he asks her "Will they ever find the dawn?" (presumably "they" being Noel and Serah).

In a city where citizens are turning into Cie'th, Caius appears behind Serah and Noel and tells them that he has to dispose of them as they are 'contradictions' in the timeline. Caius also engages in battle with Serah and Noel in Valhalla. Yeul reveals to Noel that Caius is "beyond death", apparently unable to die with full memory of all timeline events. He is shown fighting Lightning, challenging her to a fight, and at one time calling her "Impressive". He is also shown stabbing a fallen Noel in the back.

Development
Caius's clothing was designed by Yusuke Naora, who also designed Serah and Noel's clothing. His design was chosen after several designs from various members of the development team were drawn and compared to select the best one (similar to Mog). Naora stated that he was inspired by Yoshitaka Amano for the character's armor and accessories — Leon from Final Fantasy II in particular.

Etymology
Caius is an alternate spelling of Gaius, a common Roman given name. It was the first name of many famous Romans throughout history, including Julius Caesar, Augustus Caesar, and Caligula.

Trivia

 * Upon close inspection, Etro Script can be seen on Caius's armor behind his sword.
 * Caius's English voice actor is Liam O'Brien, who also voices Kain Highwind in Dissidia Final Fantasy 012.
 * Also Caius' design is closely resemble that of Kain's, from armors, weapon to hair color (in Kain's case, the helmet's wig cover his blonde hair). This hints that Caius may not necessarily the antagonist.