Carlotta
Carlotta was a holographic character in Kathryn Janeway's holoprogram of Leonardo da Vinci's workshop. 

She was from Florence and posed as a  for the maestro and his disciples. 

When The Doctor had to hide in the holoprogram in order to avoid detection by the Srivani, he posed as a  and attempted to draw Carlotta. ()

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Holograms