Neopolitan/Affiliation

Cinder's Faction
Neo is seen to work with Cinder after Roman's incarceration. She fights as the fake Haven team's fourth player in the Vytal Festival, and pilots the air bus ambulance taking Mercury Black away after his match against Yang.

Roman Torchwick
Neo was an affiliate of Roman. She seemed to be the only person Roman did not react to with utter contempt and disdain, and she quickly got him out of danger.

They were also shown to work fluidly together in combat, working off one another's attacks in a very organized display. This is depicted during the events of "Heroes and Monsters," where both fight against Ruby Rose and overpower her with relative ease.

On the DVD cast commentaries, series writer Miles Luna speculated that Neo would be even more dangerous if she didn't look up to Torchwick as much, and compared the dynamic to that of Harley Quinn and the Joker from Batman. Lindsay Jones also compares their relationship to that of a daughter and father, with Miles agreeing.

Monty Oum has said she was designed due to the need for Roman to have a right-hand woman.

Cinder Fall
Neo is part of Cinder's team during the Vytal Festival Tournament. Whilst they have not been shown interacting much, she apparently works well with her as a team in combat.

Neo's affiliations with Cinder's faction continued even while Roman was imprisoned by the Atlas military.

Yang Xiao Long
Although the two have only interacted in battle, Neo enjoyed fighting Yang, even to the extent of toying with her in the midst of combat. Yang's temper came out in reaction to this and Neo used it to her advantage. After the battle ended, Neo gave a sadistic smile as she prepared to kill Yang.

Ruby Rose
Neo and Ruby first see each other in "Painting the Town..." when Neo rescues Roman with her Semblance.

Later, when she discovers Ruby on their stolen airship, she sends Roman a message with Ruby's picture and the text "Guess who?"

When the two fight, Roman later joining in, Neo is easily able to disarm and overpower Ruby. When it looks as though Neo is readying to kill her, Ruby saves herself by pressing Neo's umbrella open and sending her off the airship via the high winds.

Raven Branwen
In "No Brakes", Neo immediately became fearful and retreated from the train car after Raven arrived via portal to stop her from killing Yang. In the Volume 2 Director's Commentary, it is stated that she retreats because she can tell that Raven is someone she cannot defeat. This is evidenced by her opponent's superior speed and telescopic blade.