Fred Monica is a gynoid with unkempt long red hair and a pair of almond-shaped golden eyes. When first appearing on the series, she wore the same style of outfit as the other gynoid. According to Touya, she is the shortest gynoid.
Later, she usually likes to wear camouflage clothes.
As all other android being made by Professor Regina Babylon, she is displaying some of the Professor's personality. The major personality that she has are immaturity and temperamental.
Monika was created about 5092 years ago along with the Library by Professor Regina Babylon after the professor looked into the future. Then around 4907 years ago, she departed separately from her sisters after the professor died.
"I will erase your memory—————-y!!" (「記憶を消してやるゼェ─────ッ！！」 ''Kioku o Keshite Yaru zee ─ ─ ─ ─ ─e!!'') - Monicaafter Touya Mochizuki accidentally saw her panties.