The main heroine of Wild Arms XF and the younger sister of Felius Arwin, who is drawn into the conflict of the Elesius Kingdom for two reasons; to pursue a cruel mercenary named Rupert Dandridge who killed her mother Melissa Arwin, as well as her uncanny resemblance to the missing princess Alexia Lynn Elesius. Clarissa agrees to impersonate as Alexia so the people don't lose hope.
Even though they look nearly identical, Clarissa and Alexia are NOT twin sisters, so the 'twins' tag shouldn't be used. To not confuse the two, Clarissa is the girl wearing blue clothes and wields a gun.