Kiraiya (キライヤ) was a female assasin who used illusions to deceive people. She tried to kill Makoto, but the illusion trick didn't work against Nanami.
[El Hazard characters]
El Hazard page
(c) AIC/PIONEER LDC・テレビ東京・SOFTX・萬年社
(c) AIC/PIONEER LDC, TV Tokyo, SOFTX, Mannensha