Dr. FRANXX

Dr. FRANXX (フランクス博士) is the old man responsible in constructing FRANXX.

Appearance
He has the appearance of an older man, sporting grey hair and a mustache. He normally wears a white coat similar to the other adults in the setting, along with white gloves, and he also uses a cane. Half of his face and several digits of his hand are mechanical.

He has a horned mask implying that he may also have been a klaxo-human like Zero Two.

Personality
He has the nature of a calm individual, with a lecherous streak as shown when he groped Nana. He takes pride in his creations, but does seem rather disinterested in the formal procedures, such as when he was asked to attend the ceremony.

History
He appears in Episode 1, escorting Zero Two along with the cargo needed for testing that he intends to carry out at the Thirteenth Plantation. When the Mohorovic-class Klaxosaur appeared, he observed it before Strelizia dispatched it.

Relationships
The doctor seems to have an almost parental relationship with Zero Two, given the tone he speaks to her with and how casually he accepts her behavior.

The doctor has an interest with Hiro due to him surviving more than 3 rides with Zero Two and says that he will be able to 'grant' her wishes.

Trivia

 * Dr. FRANXX is the one who named and classified the robots as FRANXX but is unclear if it came from his name or if his name came from naming the robots.