Dr Takeda was in charge of the development of the EW1,GDI's first attempt at creating a directed energy weapon.
During the course of the novel, he is captured by Nod and held hostage by Al-Rashan, until Private Alessio Bowles kills the Nod lieutenant.
The following is based on the cancelled Tiberium FPS and has not been confirmed by canon sources.
Ken Bishop includes concept art for one Dr Takeda on his website, indicating that he was supposed to appear in the game at one point. Furthermore, Kich Ma also includes high detail renders of this character in his online portfolio, confirming that he indeed was supposed to appear in the game.