Three Main Servants

The three main Servants in EXTELLA are Nero, Tamamo no Mae, and Altera. All of them have broad but multilayered personalities.
Nero seems to be selfish, tyrannical, and free-spirited, but is actually an infatuated lover.
Tamamo seems to be self-absorbed, poison-tongued, and hedonistically whimsical, but is actually a truly dedicated wife.
Altera seems to be a cool, solitary goddess of destruction, but is actually filled with maternal instincts (more like friendship between pure maidens).

Fate/EXTELLA material: Encyclopedia of Fate EXTELLA