Nino Lahiffe/Relationships

Chloé Bourgeois
Although aware of Chloé's feelings for Adrien and, as Bubbler, even helping her by playing slow dance music at the birthday party, Nino dislikes her and her rude, bossy personality. When Alya suspects that Chloé is Ladybug, Nino laughs it off, pointing out that no one as awful as Chloé could be Ladybug. He is also displeased by Chloé for blaming Sabrina for attempting to steal Marinette's diary instead of sharing responsibility for the crime during class president elections. In "Zombizou", he doesn't hesitate giving up Chloé to the villain's demands because of her cruel nature. In "Malediktator", he shares the pleasure of Chloé leaving for Paris.

As his alter ego Carapace he and Queen Bee work well together seen in the "Heroes' Day" finale.

Gabriel Agreste
Nino acts kind and respectful towards Gabriel whenever they interact, a bit nervous talking to such a serious figure, but he is frustrated and exasperated at Gabriel's strict parenting towards Adrien. He can tell how much Gabriel's lack of involvement hurts Adrien, and he questions if the "old man" is a robot or has always been so depressing. In "The Bubbler", he meets with Gabriel to ask him to allow Adrien to have a birthday party, but he is upset when Gabriel rejects the request, calls him a "bad influence" for Adrien, and Adrien apologizes for Gabriel's behavior. However, when it appears that Gabriel gives Adrien a scarf, although it was actually Marinette's birthday gift for him, Nino admits that perhaps Gabriel can be good when least expected and lets Adrien know that he knows he doesn't see him like a bad influence like his father.

Wayzz
Nino meets Wayzz in "Anansi", as it was his Miraculous' power that was needed to fight the umpteenth akuma. Following Nino's amused and intrigued reaction, not at all intimidated by the kwami's presence. Wayzz explains to him the instructions to turn him into a superhero, firmly sure of Ladybug's wise choice.

In "Catalyst (Heroes' Day - Part 1)", when Nino and Wayzz meet each other again, they have become closer by doing a special handshake before Wayzz helps Nino transform into Carapace.

Nora Césaire
When Nino meets Nora in "Anansi", he tries to prove his capability to protect Alya to her, as he sees Alya being captured by her sister in her akumatized form. He fights against Anansi trying to save her and buying Ladybug time to get back, once Nora was deakumatized he earns her recognition.