Kiko Mizuhara as Robomatsu (Excel Saga)

Robomatsu/Roppenmatsu is a supporting character in Excel Saga. 'She's' android designed for police work and even without her superhuman powers is a far more competent member of city security than her human companions. As an android 'she' is emotionless and job oriented, which strangely makes 'her' very appealing to certain men. Robbomatsu, has a lot of untapped potential as a character and so i think including 'her' should be pretty fun for a film franchise. 

Kiko Mizuhara is a Korean-American-Japanese actress and model known to me for her work as Mikasa in the AOT life actions films. Considering that Mikasa is an extremely reserved character and an action lead and playing her requires good stunt work i think Kiko is more than qualified to portray a combat android.