Cardin Winchester/Affiliation

Beacon Academy
Cardin is a student at Beacon Academy.

CRDL
Cardin is the leader of Team CRDL.

Jaune Arc
Jaune has been bullied by Cardin for weeks since class started and Cardin seems to view Jaune as weak and worthless, even suggesting it would be fine if Jaune were to be killed by a Beowolf. Cardin also seem to enjoy tormenting Jaune as much as he has him to favors for him. As of episode 13, Jaune is seen doing many favors for Cardin, such as his homework and projects, and even collecting items for a field trip to the Forever Fall forest.

During the trip to Forever Fall, Cardin attempts to get Jaune to take part in a revenge scheme targeting Pyrrha, but Jaune refuses to harm his fellow teammate and Cardin beats him up. Even so, when Cardin is attacked by an Ursa Jaune fights to protect him and defeats the Grimm. As a consequence, Cardin seems to have developed a certain respect for Jaune's abilities as a fighter.

Velvet Scarlatina
Velvet is another victim of bullying by Cardin, with his fellow team members taking part in the bullying. It appears their actions are motivated by her status as a Faunus.

Pyrrha Nikos
Cardin seems to have a strong dislike for Pyrrha, calling her a "know-it-all". His dislike stems from her insutling him for his tolerance and then making a fool of him in Dr. Oobleck's class by then correctly answering the question he got wrong. He later attempts to have her attacked by Rapier Wasps in retribution.

Bartholomew Oobleck
Cardin has been doing poorly in Oobleck's class and does not appear to take it seriously. The bigotry and ignorance Cardin exhibits towards the Faunus seems to disappoint Oobleck as Oobleck shakes his head when Cardin suggests Faunus had an advantage in the Faunus War because "an animal" is easier to train than a human. Oobleck later reprimands him and Jaune for their poor performance in his class and assigns them extra work, though Cardin later blackmails Jaune into doing the work for both of them.