The character's other storylines have often revolved around her romantic relationships with Mason Turner (Taylor Glockner), Tyler Brennan (Travis Burns), and Daniel Robinson (Tim Phillipps), whom she married before leaving for a job opportunity in the United States on 26 April 2016.

Imogen helps run Toadfish Rebecchi's (Ryan Moloney) law firm and becomes Finn Kelly's (Rob Mills) defence lawyer, which causes conflict with her family and neighbours.

"[1] The character of Brad Willis (Kip Gamblin) was reintroduced to the show, along with his wife Terese (Rebekah Elmaloglou) and two children Josh (Harley Bonner) and Imogen.

[8] Kaplan believed Imogen was a good role model for younger female viewers, saying "I love the character, she is outwardly confident and very comfortable in her own skin, and doesn't feel she has to impress anyone by doing things she might regret.

[15][16] Imogen's storyline was the first to portray the issues of eating disorders in the show for six years, with the last one featuring male character Ringo Brown (Sam Clark).

[16] Kaplan was told about the storyline a couple of months ahead of filming and in order to do it justice, she began researching the condition.

[3] The producers also worked closely with the Butterfly Foundation to develop the scripts and made sure they portrayed an accurate representation of the condition.

[16] The foundation's CEO, Christine Morgan, stated that they were "grateful" for the way the producers developed the storyline and hoped it would increase awareness of eating disorders.

[16] Kaplan explained that Imogen had been keeping her eating disorder a secret from her family and that it stemmed from a lack of attention, as she was often overshadowed by her brother's swimming career.

[15] Kaplan told Jackie Brygel from TV Week, "Imogen is a smart girl, so she's scared to be seen as vulnerable and weak.

[18] Imogen briefly dated her neighbour Mason Turner (Taylor Glockner), following the end of his relationship with her teacher Kate Ramsay (Ashleigh Brewer).

[23] Kaplan told an Inside Soap reporter that there would be a rough road ahead for Imogen and Mason when a "major crisis" impacts on their families.

"[29] Imogen insisted that she no longer had feelings for Daniel, but her half-sister Paige Smith (Olympia Valance) had doubts and tried to make sure that she was taking the next step with Tyler for the right reasons.

[29] On 4 April 2016, Daniel Kilkelly of Digital Spy speculated Kaplan had left Neighbours due to posts on her social media accounts that appeared to be "disguised farewells" to the show.

[30] A week later, Kilkelly and Sophie Dainty confirmed Imogen would be leaving the show, alongside Daniel (Tim Phillipps) on 26 April.

[31] Imogen receives a job offer from Naomi Canning in Los Angeles, and she and Daniel decide to move over there for a fresh start, following the deaths of Josh and Doug Willis (Terence Donovan).

[34] Imogen soon discovers that her younger sister Piper Willis (Mavournee Hazel) is in a casual relationship with their mother's former partner Leo Tanaka (Tim Kano), and urges her to tell Terese or she will.

"[35] Imogen's decision to represent Finn causes conflict with her family and friends, and she later receives a threat in the form of a pig's head left on her car.

[37] Kaplan continued to make appearances in 2023, including during a week of flashback episodes designed to showcase to viewers stories that occurred whilst Neighbours had ceased broadcasting.

While undergoing work experience at Toadie Rebecchi's law office, Imogen learns a client, Eric Edwards (Paul O'Brien), is suing Brad over an injury he sustained at the gym.

Imogen is shocked to discover she has a secret half-sister and she is initially angry with her father, but she accepts that Brad was unaware that the child existed and supports him when he begins searching for his daughter.

When Amber is called away days before her wedding, Imogen helps with the organisation, and Paul Robinson (Stefan Dennis) realises she has feelings for Daniel.

Imogen meets with Finn Kelly and tells him he needs some legal advice, after learning that he has retrograde amnesia and is unable to recall the many crimes he has committed.

Shortly after her introduction, Jackie Brygel and Thomas Mitchell from TV Week commented "Imogen Willis has largely flown under the radar since her family arrived in Erinsborough.

"[24] Ben Pobjie, writing for The Sydney Morning Herald, called Imogen "the Walking Aneurysm" and observed that "she just enjoys being angry at people.

"[44] Pobjie later dedicated a review to Imogen skipping school and losing the captaincy, calling it "the 6.30 timeslot's equivalent of Girls Gone Wild".

[46] A Soap World writer thought Imogen was a problem character, saying "Yes, she's fiery and funny but why the lack of romance in her life?

Kaplan addressed the complaints on her social media, writing "While I realise many people aren't loving Imo's attitude (she sure is fierce), I promise she's not THAT bad the entire time.

"[48] Kaplan later received hate comments from viewers who disliked Imogen's attitude, leading to her co-star Mavournee Hazel to come to her defence.

"[49] Simon Timblick of Radio Times commented that Imogen "made herself Public Enemy No.1 by becoming Finn Kelly's (Rob Mills) lawyer".