Gabriel Agreste/Relationships

Nathalie Sancoeur
Gabriel trusts his personal assistant, Nathalie, to take care of tasks for him and Adrien. He doesn't appreciate when she messes up, however, as when he gets impatient with her when she forgets to get a birthday present to give to Adrien on his behalf. When she gives him useful advice, he listens intently and takes it, as when he agrees with her to let Adrien attend public school in "Stoneheart" and to be there for Adrien on their first Christmas without his wife in "A Christmas Special". He trusts her enough that she knows that he is Hawk Moth, explaining his scheme to her about throwing Adrien and Ladybug off his trail in "The Collector".

Nooroo
Gabriel views Nooroo, his kwami, as nothing more than his slave. After Gabriel proclaims that he intends to use the Butterfly Miraculous' power to create supervillains instead of superheroes, Nooroo attempts to tell him that the Miraculous aren't supposed to be used for evil, but he refuses to listen. He yells at Nooroo, reminds him that he is his master now, and demands his obedience.

Emilie Agreste
Not much is known about the relationship between the couple. However, Gabriel did genuinely and strongly care for his wife. There are moments that show he misses her a lot, including in the Christmas special when he sadly looks at the portrait of her in his atelier. According to Adrien in the webisode "Adrien's Double Life", ever since Emilie disappeared, Gabriel has not been the same. He has an image of her in the Butterfly Miraculous. In "The Collector", he tells Adrien the Miraculous Spellbook was his last gift from his wife, and he tells Marinette that he got the book while he and his wife were overseas.

Nino Lahiffe
Gabriel has a strong distaste for Nino and believes that Nino is a bad influence on Adrien. When Nino objects to him not allowing Adrien to have a birthday party in "The Bubbler," Gabriel, displeased with his authority and decisions being questioned, tells Nino that he is not allowed in the mansion anymore because he is a bad influence on his son. However, in "Simon Says", he appears to have either forgotten about this or gotten over it, as he hardly acknowledges his presence inside the mansion.

Chloé Bourgeois
While Gabriel doesn't care much for Chloé, he acknowledges in "Despair Bear" that he relies on Chloé's cruelty and nastiness to make people emotionally vulnerable enough to be akumatized, so much so that he sends out an akuma ahead of an opportune victim when she holds a huge party.