Vivio Takamachi

Vivio is a young blonde girl with a complete heterochromia, her right eye being green and her left one, red. She is a very lively and optimistic girl who is very close to her "mothers" Nanoha and Fate. She was a bit childish and somewhat of a crybaby initially, but becomes more cheerful in the manga. She turns out to be a clone of Saint King Olivie Sägebrecht created by Scaglietti, as she is intended to be a vessel for The Saint's Cradle.