Billy Katagiri

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Evil-doer
Full Name	Billy Katagiri
Alias	Billy
Origin	Mobile Suit Gundam 00
Occupation	MS Technical Advisor (previously) MS Technical Chief
Powers / Skills	Several knowledge about technology, mechanical and robotic
Hobby	Helping Graham to develop his Mobile Suit. Having fun and helping Leesa Kujo.
Goals	To devote his life to Innovator for destroy Celestial Being and create a peace (formerly). To dedicate his life to develop new Mobile Suit.
Crimes	No information
Type of Villain	Delusional Friend of the Hero

“	Kujo. All the time, you were simply using me. And then you took my feelings and destroyed them all.	„
	~ Billy thinking that Leesa betray his feeling.

Billy Katagiri (ビリー・カタギリ, Birī Katagiri?) is a fictional character in Mobile Suit Gundam 00. Billy is an MS engineer for the Union's MSWΛD in Season 1. In season 2, he becomes A-Laws' chief technical engineer to develop new generation mobile weapons for the ESF and the Innovators.

He is close friend of Graham Aker and Leesa Kujo (who known as Sumeragi Lee Noriega in Celestial Being side), Lover and later husband of Mina Carmine (the DNA origin of Nena Trinity) and nephew of Homer Katagiri, commander of A-Laws.

Description

Billy is overall a sentimental, passionate, romantic, and caring person for those important in his life. After learning Leesa (Sumeragi Lee Noriega) is part of Celestial Being, his emotions had taken a negative change. He became spiteful, vengeful, and discontent how things turned out between him and Sumeragi. He has since poured all his feelings into MS development to help cope with his anger/hatred against Celestial Being. Sumeragi tells him that he's wrong and the A-Laws were wrong.

Billy is Homer Katagiri nephew. Though they have little interaction with each other due to their respective jobs, it can be said that the two hold a great deal of respect for each other.By the end of AD 2312 (season 2), after reconciling with Leesa he reverted back to his original personality and continues to devote his life into MS advancement.

Even his relationship with Leesa already reconciled, they not continue their relationship into lovers. In Mobile Suit Gundam 00 The Movie: A wakening of the Trailblazer, its shown he have romantic relationship with the flirtatious female scientist named Mina Carmine. In epilogue mention he marry her and have a children.