Ferdinand

"I am your Uncle, a servant of the empire, also your only supporter who's in charge of the aftermath work and the communication between spirit witches in different districts"'

- Ferdinand to Sofia/Lilina

Ferdinand is Empire's King brother and uncle of Sofia and Sarah/Samja. He's known as Empire's Spirit Witch contact and his role is to watch her and contact Spirit Witches of others region in case of need. He's aware that Sarah is the Spirit Witch and cover her identity and acts in case of need.

Unaware that Lilina take Sofia's body, he believe that the Lust Queen is the responsible of "Sofia's amnesia" and swear to catch her. So he help Lilina/Sofia to recover memory and lend her his knowledges about Spirit Witches.

Ferdinand go for Torres in order to save the region from a huge monster attack.

He come back later, after the Beast Lady line and discover that Sofia choose Owen as retainer. Since he can't trust this man, he choose to submit Owen to a trial. Lilina will see him have sex with Jeane cosplayed as Sofia, discovering that her maid love Ferdinand, but his uncle want some incest sex with her niece. ''' WARNING ! The following part contain major spoiler !'''

In Betrayed part, we discover that Ferdinand is actually a Monster who try to bring back Arianna to submit her. For this, he try to push a Spirit Witch to gain Overlord Worm form in order to have the same power than Arianna and use the magic device to give to princesses who become Spirit Witch the same hair than Arianna. We also learn that he submitted Sofia (probably after that the princess saved Lilina, we still to have the full story in a further update)

In Arianna bad end, he manage to use Lilina to bring Arianna's soul back in Lilina's body but Arianna kill him.

Relationship
Empire's King : they are brothers

Feldt : We don't know anything about the relation between them

Elena/Irina : We don't know what kind of relations they had, but since Irina was a Spirit Witch (according to the information we got in the Beast Lady Bad End : Irina had the same lust tatoo that Sofia), Ferdinand and Irina were probably partners just like Ferdinand is with Sofia

Sarah/Samja : He is her uncle, we dont know anything more.

Sofia : he know she is the Spirit Witch and helped her by gathering informations, contact other spirit witches and cover her acts. That said, Ferdinand is secretly in love for her, even if this is incest... or it was what it seem until we discover that Ferdinand wanted to summon Arianna in a Spirit Witch so he just saw Arianna in Sofia's apparence.

Lilina : He believe she's guilty for the Archmages murdering and stealing Sofia's memories. He swear to find her and make her pay.

Jeane : Jeane love him and she have sex with him each night, cosplayed as Sofia. She even pledge loyalty to him. We finally discovered that Jeane is Sofia and became Ferdinand's Witch Bitch.