Billy Katagiri

Billy Katagiri (ビリー・カタギリ
 * Voiced by: Yūji Ueda [1]

He's an engineer and technical adviser for the Union's MSWΛD/Anti-Gundam Investigative Squad "Over Flags" and the co-developer of the SVMS-01 Union Flag. He's a good friend of Graham, former colleague to Sumeragi, and assistant developer with Professor Leif Aifman.

Relationships

 * Sumeragi Noriega
 * Billy studied with Sumeragi under Professor Leif Aifman during their earlier years. He developed feelings for Sumeragi when they studied together and remained interested in her during their time apart. Unknown to Billy, he's been giving off tactical secrets from the Union to Sumeragi, Celestial Being's tactical analyst.