Marrow Amin/Affiliation

Atlas Academy
Marrow was a student at Atlas, and graduated as a member of the military.

Atlas Military
Marrow is the newest addition of the Ace-Ops, Atlas’ elite fighting force. As a result, he is one of James Ironwood 's most trusted individuals, with knowledge of Salem and her group, as well as the Relics and the Maidens.

Ace-Ops
Marrow is the newest member of the Ace-Ops team. As the rookie, he is often to butt of the Ace-Ops' jokes, having to be 'babysat' by the older members.

Elm Ederne
Marrow and Elm seem to share a form of rivalry one another, where once Marrow claimed he "all asset and zero liability," Elm chastised him, claiming they had to put up with his loud mouth. Marrow reacts in frustration as she walks away, laughing.

Later, Elm pushes Marrow to the ground jokingly when introducing Teams RWBY and JNPR to the Huntsmen board. Later, Marrow, Elm, and Vine help the new Huntsmen team train.

Vine Zeki
Vine assures Elm's views on Marrow's loud mouth, walking away whilst laughing at him. Later, Vine joins Marrow when introducing Teams RWBY and JNPR to the Huntsmen board. Later, Marrow, Elm, and Vine help the new Huntsmen team train.

Ruby Rose
In “Pomp and Circumstance”, Ruby showed admiration to Marrow and the other members of the Ace-Ops, being awed by the fact that they took down the Geist from ‘Ace Operatives”, without using any kind of tactics. Later, Marrow is annoyed Ruby interrupted his mission with Penny Polendina in guarding Robyn Hill's election party, wishing to concentrate on the mission.

Weiss Schnee
In "Ace Operatives", Marrow explains to Weiss and Blake the societal issues with the Faunus in Atlas. He also tells her despite the abuse his species faces, he's not looking to solve those issues.

Blake Belladonna
In "Ace Operatives", Marrow explains to Weiss and Blake the societal issues with the Faunus in Atlas. He also tells her despite the abuse his species faces, he's not looking to solve those issues. Marrow trusts Blake enough to scout the collapsed mines alone without backup.

Later, in "Sparks", he asks Blake and Yang if they should pair off with other team members, noting they only ever worked with each other.

Yang Xiao Long
Marrow asks Blake and Yang if they should pair off with other team members, noting they only ever worked with each other.

Jaune Arc
In “Pomp and Circumstance”, Jaune showed admiration to Marrow and the other members of the Ace-Ops, being awed by the fact that they took down the Geist from ‘Ace Operatives”, without using any kind of tactics. Later, after viewing the mission board, Marrow seems to not really care about to remembering Jaune's name, such as calling him "Juan", "Jwan" and "Jim" (With Jaune awkwardly commenting that the names were close enough to his own).

In “Sparks”, Jaune was annoyed when Marrow giving him a pleading stare while waggling his tail; pleading silently to the leader of Team JNPR to give him his coffee. Even so, Jaune still gave the dog Faunus his coffee with a frown on his face. Later, Jaune and Marrow seem to be gettting along with each other a little better, and the next time Jaune brought with him two mugs of coffee and hands Marrow the other one. Smiling to each other, they clink their mugs together.

Happy Huntresses
Marrow displays a disliking towards the Happy Huntresses, alluding to the fact he'd have no qualms towards arresting them if they did anything that seemed remotely illegal, hinting at their borderline vigilante activies.