CPUs
Neptune
Neptune and Rom are both goddesses and have went through ASIC and the Rei Ryghts crisis together. Due to Neptune's childlike nature, she can get along with Rom when she visits. The two had a walletcrusher segment as well. Rom generally supports Blanc against Neptune in the various petty goddess contests the goddesses get themselves in. In the end, the two are friends.
Noire
Hyper Dimension
Rom and Noire don't really interact much. The two have gone through ASIC and Rei Ryghts crises together. During Hyperdimension Neptunia V (and its remake) it is stated that Rom finds Noire a bit scary, probably due to her strict personality. The two however view each other positively.
Ultra Dimension
Rom assisted this Noire in the Rei Ryghts crisis. The two do not really interact beyond that. The two view each other positively.
Blanc
Hyper Dimension
Rom is Blanc's sister. Rom loves her sister Blanc, more than she loves Miss Nepgear. Rom also likes making Blanc angry because she sees that as Blanc caring for her. Rom takes after the quieter aspects of Blanc. Whenever the Planeptune sisters visit, the groupings go like this Rom, Blanc and Nepgear are together, while Ram and Neptune are together. Blanc is somewhat proud of Rom's cuteness bragging about how her sisters combined got more photos in a cosplay convention. Rom also wants to make Blanc happy, as she works hard for Lowee and when she decided to debut as an idol to surprise her sister. Rom and Blanc care for each other as family members.
Ultra Dimension
Rom was a bit more uncomfortable with this Blanc. She felt that this Blanc was not her sister even if she "smelled" the same. Over time, she did get used to the other Blanc. The two worked together to stop Rei Ryghts.
Vert
Hyper Dimension
Vert has been able to get Rom to debut as an idol and cosplay. Rom sees Vert as an elder and seems to be quite willing to listen to her when doing all the fun events. Rom still has fun so it all works out for Vert and Rom. The two are friends who also defended Gamindustri from ASIC and Rei Ryghts.
Ultra Dimension
Rom assisted this Vert with the Rei Ryghts incident. The two did not interact much beyond that. The two view each other positively.
Plutia
Rom assisted Plutia with the Rei Ryghts incident. She also notes, while Plutia is scary, she has kind of gotten used to it so she is not scary anymore. The two view each other positively.
Peashy
Peashy accidently pushed Rom with the candidates were all crowding around Nepgear. Rom helped Peashy with the Rei Ryghts incident and the two view each other positively.
Uzume Tennouboshi
CPU Candidates
Nepgear
Rom idolizes "Miss Nepgear". Nepgear is very kind to Rom, showing neat gadgets and just helping her a lot whenever she needs it, be it finding a pen or giving Rom space, so she can still be close to her sister Ram. The two bonded together as fellow candidates in the events of Hyperdimension Neptunia mk2 and its remake. The two are very close friends.
Uni
Rom and Uni bonded together throughout the events of Hyperdimension Neptunia mk2 and its remake. The two are good friends.
Ram
Rom and Ram are twin sisters. Ram is younger yet pushes Rom around which she doesn't mind. Rom, being shy needs Ram to see things before she does. Ram can in turn, always count on Rom's support. Ram is always ready to take charge and protect Rom from any nasty situations. This has made Ram jealous when Nepgear somewhat replaced her role but Ram got over it. Unlike Blanc, who was absent for three years, Rom and Ram were always together. The two are very close in age and as family members.
Makers
IF
IF and Rom have worked together to stop ASIC in the events of Hyperdimension Neptunia mk2 and its remake. The two view each other positively.
Compa
Compa and Rom have worked together to stop ASIC in the events of Hyperdimension Neptunia mk2 and its remake. The two view each other positively.
Nisa
Rom and Nisa have worked together to stop ASIC in the events of Hyperdimension Neptunia mk2. The two view each other positively.
Gust
Rom and Gust have worked together to stop ASIC in the events of Hyperdimension Neptunia mk2. The two view each other positively.
5pb.
Rom and 5pb. worked together to stop ASIC in the events of Hyperdimension Neptunia mk2 and its remake. The two view each other positively.
Cave
Rom and Cave worked together to stop ASIC in the events of Hyperdimension Neptunia mk2 and its remake. Additionally when 5pb. was whisked into the Ultra Dimension, Rom helped Cave look for 5pb. Rom likes how cute Cave is when she has sweets. The two view each other positively.
MAGES.
Rom and MAGES. have helped Neptune in her Ultra Dimension adventures. MAGES. has shown off her gadgets to Rom and Ram impressing both of them. Her Nepgear robot, however is not popular with the twins. The two view each other positively.
Falcom
Rom and Falcom worked together to stop ASIC in the events of Hyperdimension Neptunia mk2 and its remake. Additionally Falcom has tried to give Rom and Ram tons of sweets since all the people she saved gave her sweets in return. Rom, knowing Falcom's nosiness means that she gets a lot of sweets. She expects this from Falcom and the two view each other positively.
RED
Rom and Red worked together to stop ASIC in the events of Hyperdimension Neptunia Re;Birth2. In the Ultra Dimension, Rom has wondered how many wifeys has RED acquired outside of the goddesses. Apparently none and RED runs off to acquire more leaving Rom wondering how easy is it to acquire wifeys. The two view each other positively.
Broccoli
Rom and Nisa have worked together to stop ASIC in the events of Hyperdimension Neptunia Re;Birth2. The two view each other positively.
CyberConnect2
Rom and CyberConnect2 have worked together to stop ASIC in the events of Hyperdimension Neptunia Re;Birth2. The two view each other positively.
MarvelousAQL
Hyper Dimension
Rom and MarvelousAQL have worked together to stop ASIC in the events of Hyperdimension Neptunia Re;Birth2. The two view each other positively.
Ultra Dimension
Rom and MarvelousAQL have assisted Neptune in her Ultra Dimension adventures. Additionally Rom notes how Blanc has been trying to make futomaki but none of it tastes as good as Marvy's. Marvy decides to help Rom and Ram make good futomaki for their older sisters. However they made so much the Basilicom broke. The two view each other positively.
Tekken
Rom and Tekken have worked together to stop ASIC in the events of Hyperdimension Neptunia Re;Birth2. The two view each other positively.
Oracles
Histoire
Rom has helped Histoire deal with ASIC. Histoire has also commanded Rom before Neptune returned to the Hyper Dimension when dealing with the Rei Ryghts crisis. The two view each other positively.
Kei Jinguji
Rom has helped Kei deal with ASIC. The two view each other positively.
Mina Nishizawa
Similar to Neptune and Histoire, Mina acts a parent for Rom. The only difference is that Mina is supposed to be a parent to Rom seeing as how her older sister Blanc was trapped in the Gamindustri Graveyard for 3 years, while Histoire would rather not lecture Neptune everytime she wants her to get working. Mina cares for Rom, not allowing her to get into danger by joining Nepgear in her adventures but respects Rom's decision if she so chooses to help Nepgear. Mina has taught Rom magic as well. Rom has helped Mina deal with ASIC. Rom and Mina are essentially family, while being goddess and oracle.
Chika Hakozaki
Rom has helped Chika deal with ASIC. The two view each other positively.
Antagonists
Linda
Rom was initially scared of Linda who kidnapped her. Over time though, Rom has constantly defeated Linda over and over again. The two dislike each other.
Warechu
Rom has defeated Warechu many times to foil ASIC's plans. The two dislike one another.
CFW Judge
Rom and the party has destroyed CFW Judge to rescue her sister and the rest of the goddesses to ultimately end ASIC. The two dislike one another.
CFW Brave
Rom and the party has destroyed CFW Brave to defeat ASIC. However, Brave being chilvarious, comes to terms with what the goddesses' methods of making children happy. The two don't dislike one another.
CFW Trick
Rom has dealt with Trick's obsession for her. Rom absolutely hates Trick and wants to forget all about him after destroying him. Trick adores little girls and Rom is no exception.
CFW Magic
Rom and the party has destroyed CFW Magic to defeat ASIC. The two dislike one another.
Arfoire
Rom and the party has destroyed the Deity of Sin, Arfoire to save Gamindustri. The two dislike one another.
Rei Ryghts
Hyper Dimension
Rom has had to deal with some angry brainwashed citizens as a result of Rei Ryghts. Rom and the other goddesses defeated Rei Ryghts to save both dimensions. Afterwards Rei lost her memories of what happened while she had her counterpart's power so she does not remember Rom. Rom probably harbors no ill will against Rei either.
Ultra Dimension
This Rei has assisted Rom and the goddesses in defeating her counterpart. Afterwards Rei Ryghts reformed the Seven Sages to help the goddesses. The two view each other positively.
Croire
Croire has caused the Rei Ryghts incident troubling Rom and the other goddesses. The two dislike one another.
Bamo
Rom has stopped Bamo's plan to create Sociomobilindustri. Afterwards Rom and the goddesses let Bamo off the hook into a southern continent. The two are no longer enemies but not friends either.
Regu
Rom has stopped Regu's plan to create Sociomobilindustri. Afterwards Rom and the goddesses let Regu off the hook into a southern continent. The two are no longer enemies but not friends either.