Marina Ida's History
Past
Marina was born into "the oppression of Octarian society" as she would later describe it and began to be trained as a combat engineer from a very early age. She graduated from elementary training at the age of 9 after skipping multiple grades and for the next few years went on to play a part in designing the Flooder and enhancing the Great Octoweapons.
During the events of Splatoon, she had received multiple commendations as part of DJ Octavio's wasabi supply unit. As a high-ranking member, she was known throughout Octarian society, and was recognized by Agent 8 despite never meeting personally. She was present at the ‘concert’ hosted by DJ Octavio in his fight against Agent 3, but deserted shortly after hearing the Squid Sisters' Calamari Inkantation. According to witnesses, her only comment was "This changes everything." Then she escaped to Mount Nantai, where she did not even understand the Inkling language. While there, she met an Inkling called Pearl Houzuki, who was practicing singing. Learning about Inkling culture and customs.
Marina attempted to find Pearl again. When she did, she showed Pearl her musical abilities through her demo of Ebb & Flow and Pearl immediately agreed to them starting a band, forming Off the Hook in the process. They released Ebb & Flow as their first single, which was a hit. By the time of their fourth single, around nine months after the events of Splatoon, they had become popular enough to take over hosting Inkopolis News from the Squid Sisters.
Splatoon 2
By the time of Splatoon 2, Off the Hook had become famous in Inkopolis Square for their music and for presenting Inkopolis News, in which Marina had a similar relationship with Pearl as Callie and Marie had. Their work included hosting Splatfest events, announcing the themes and singing and dancing to Color Pulse for the event's duration. Although Pearl and Marina did not make appearances during Octo Canyon, they were the first to break the news of Callie and the Great Zapfish's disappearances. They also announced their rescue on Inkopolis News, fulfilling a request to play Fresh Start over the credits.
Octo Expansion
When the game starts up the first time in the 3.1.0. update, Pearl will put an Inkopolis Fashion Focus about a trend of "squidkids with weird hairstyles" which are actually Octolings. As the broadcast ends, Pearl says that that was the only best thing so she'll probably never do it again.
Off the Hook makes an appearance helping Agent 8 and Cap'n Cuttlefish by giving advice and commentary on Agent 8's tests. They meet the duo after Agent 8 passes Fake Plastic Station through Cap'n Cuttlefish's walkie-talkie as they were on Mount Nantai where the signal was the strongest, and Pearl and Marina call themselves MC. Princess and DJ_Hyperfresh respectively. If Agent 8 loses all of their lives in a test at least twice, Marina will offer to use Agent 8's test data and hack the Kamabo Corporation's data base to trick the test into thinking Agent 8 passed. If Agent 8 has less than 100 CQ Points, then Pearl will take money from her dad's wallet and Marina will transfer them into CQ Points.
After Agent 8 collects all the Thangs, Marina discovers it makes a blender and the Telephone that had them find the Thangs is intent on actually blending Agent 8 and Cap'n Cuttlefish into raw material. Before it can do so, however, Marina activates Agent 8's CQ-80's distress signal, summoning Agent 3 and breaking the blender and phone in the nick of time. Marina then sees an unconscious Agent 3's employee model of the CQ-80 and tells Agent 8 that they can escape through the hole Agent 3 made. As Agent 8 escapes the facility, Off the Hook shows up with a fleet of helicopters to pick them up along with Cap'n Cuttlefish and Agent 3.
As Pearl raps with Cap'n Cuttlefish again, the platform Agent 8 was on rises up and turns out to be a statue with the phone known as Commander Tartar intending on destroying all Inklings and Octolings with his blast of primordial ooze. Marina analyzes the statue and discovers that the statue is charging up via sunlight. If they can cover it with ink with the help of her prototype Hyperbombs that Agent 8 has to manually detonate, then the statue will stop charging, and Pearl will then finish it off with a "Hypersonic Scream" to destroy the statue, but they have to do so within three minutes, or Tartar will destroy Inkopolis.
After Agent 8 detonates them all, the statue is going to fire anyway, prompting Pearl to drop onto the platform below the helicopter and activate her Special, a giant Killer Wail stylized with her crown. As the statue fires, Pearl lets out a giant "Booyah" and battles with the statue's blast before pushing it back and destroying the whole statue with pink ink, along with Tartar, who's last words are telling the professor who created it that their reunion beckons before perishing. As the statue now collapses into the sea, Pearl and Marina celebrate with Cuttlefish, Agent 8, and a recovered Agent 3, and then watch the credits.