Biokilulu is a Millefiore Famiglia character that was introduced in Fate of Heat 2 and a member of Belladonna Lily, the Millefiore's Assassination Squad. She fights using chemicals to rain acid on her enemies. A faithful, obstinate scientist researching Box Weapons, her research led her to the discovery of Mechanical Beasts (an evolved form of the Box Weapons), and the fusion of those with trained soldiers to create powerful Half-Mechanical Beasts. One of the dialogues in the game featuring Squalo and Belphegor seems to hint that she was a former Varia officer that defected to the enemy.