Sette

Along with Otto and Deed, Sette was one of the last Numbers to be completed. Nevertheless, she possess outstanding fighting capacities, proven by the fact that she helped Tre take down an army of TSAB Air Forces' mages during her first real-life combat experience. She was tutored by Tre, who gave her a strict and severe training. Because of that, Sette has great respect for the older woman and even share some of her personality traits. Sette was defeated and captured by Fate. In the StrikerS epilogue, it was shown that she was the only late generation Number kept at the high-security facility along with Scaglietti, although this has probably due to her loyalty to Tre than to the Doctor.

She is also the only Number in the SSX sound stage who is not given a speaking role or mentioned in any way. -Wikipedia-