Atlantica is a gynoid with three braided hair that being braided into one brown hair, white skin and a pair of golden eyes. When first appearing in the series, Atlantica is shown to be wearing a large pink ribbon on the blue regular tunic with a white skirt and white tight.
As a android made by Regina Babylon she has some of the professor's personality.
For determining anyone that passes the teleportation magic circle test as a truly compatible person. Professor Regina Babylon gave her creations, the gynoid, freedom to have the final judgment.
After Touya Mochizuki introduced himself as the owner of all other Babylon she acknowledged Touya as her master.
Tika was created about 5092 years ago along with the Laboratory 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.
Based on the character introduction:
She looks like a decent person but actually a hardcore lolicon.
9Chapter #65, When Touya met Cesca, she said she was created 5092 years ago.