Luca McIntyre

Upon his introduction, it is revealed that Luca is homeless. He tries to rely on friends that could let him sleep on their sofas, but his hopes are "dashed" when they inform him that he cannot stay there.[8] Luca's introductory episode also explores the final moments of his relationship with boyfriend Billy Parker (Daniel Cornish). The scenes show Luca driving Billy back to his house after a night out, and whilst looking over at him, Luca crashes and Billy dies from the impact. Luca's "past comes back to haunt him" in the form of Billy's brother, Jonno Parker (Tommy Sim'aan).[9] Jonno feels that Luca is responsible for Billy's death and visits Luca, demanding that Luca gets him painkillers from the surgery. Luca begins to sleep in his consultation room until Ruhma arrives for her shift early and discovers him. She "offers a listening ear as pressure builds" for him and tells him that he cannot sleep at the Mill.[10] Luca forms a friendship with Emma Reid (Dido Miles), who rents rooms in her house out as a bed and breakfast and allows him to stay. Their newfound friendship leaves Emma's former best friend Zara "miffed".[11] Weeks after Luca has supplied him with pills, Jonno revisits him as he has realised that Luca has given him sugar pills to save himself from getting fired. Jonno visits Zara and tells her about Luca's car accident with Billy, and to Luca's surprise, she defends him and tells Jonno to leave.[12]

Months after his last encounter with Jonno, Luca hears that he has gone missing and that his family members are worried about his whereabouts. Despite the fact that Luca "doesn't really want to get mixed-up with Jonno again" and Emma warning him not to become personally involved with him, Luca begins searching for him.[13] After finding him addicted to painkillers, Luca tells Jonno that he will help his detox process as he feels he owes it to Billy. He offers to get Jonno into a rehabilitation centre, which he snaps at and once again accuses Luca of killing Billy, leaving him "stung".[14] Timblick wondered if Luca was out of his depth in helping Jonno to recover from his drug addiction.[14] Emma allows Luca to invite Jonno to stay at their house where the pair help him to detox; they eventually persuade him to seek help from a drug rehabilitation clinic. Jonno thanks Luca for his help and assures him that Billy would be thankful.[15]

When Daniel Granger (Matthew Chambers) receives an email from Luca with two Xs, which he believes is Luca's form of flirting with him. It leaves Daniel believing that he has "still got it" and gives him confidence, which annoys Zara, his partner.[16] Luca then finds a photograph of Daniel posing as James Bond and pretends to flirt with Daniel, who "can't get enough of the extra attention".[17] Daniel smugly tells Luca that he is flattered by the attention, but that he is not interested in him romantically, to which Luca assures that he is not attracted to every man just due to being gay.[17] Luca goes on a date with Zach Wilson (Luke Grant) who gets overly drunk and accidentally headbutts Luca. He does not feel a romantic connection with Zach. When Emma asks why, Luca explains that since Billy's death, he feels uncomfortable in relationships and prefers casual sex.[18] During Birmingham Pride, Luca gets into a "heated debate" with Zara over the gay pride flag.[19] Luca feels that the rainbow should be used solely for the gay community, while Zara argues that the rainbow could be used for the NHS, which leads to a lesson in diversity led by Emma.[19]

Luca treats 18-year-old Conor Bradshaw (Jack O'Connor), who is worried that he may have gotten a sexually transmitted infection (STI) after having sex with a man for the first time. He initially refuses to let Luca examine him, but Luca persuades him to allow it. Luca confirms that there are signs of an STI, and Conor panics that he has got HIV, and is going to die. Luca tries to comfort Conor by informing him that he is HIV-positive and that he leads a healthy and full life. Conor is disgusted due to his misinformed belief that HIV can be caught, despite Luca being on antiretroviral medication.[20] Luca finds himself "the subject of online gossip and speculation" after Conor posts about there being a nurse at the Mill with HIV.[21] Conor's post circulates and attracts attention from patients of the Mill, and after reading the online comments made about him, he "breaks down in tears" at work.[21] After a number of patients cancel their appointments with Luca, Daniel and Bear suggest that Luca should post an online video talking about his HIV and the misinformation circulating about the disease. He feels "sick of having his privacy invaded" and announces that he plans on leaving the Mill.[22] Luca becomes "the centre of more unwanted attention" when Tony Lambert (Dean Williamson) leads a protest at the Mill, demanding that Luca is sacked.[23] Emma convinces Luca to stay and helps him to film a video for the Mill's social media in the hopes to "set the record straight and convince the hateful crowd outside the surgery to call-off their protest".[24] Despite the video, the Mill is vandalised with hate graffiti that sees Luca nicknamed the 'Killer Nurse'. The protests return to the Mill as Luca turns up for work and he confronts them, after which the scandal blows over.[25]

Luca begins caring for patient Winnie Jones (Tina Gray), who is wanting to travel around the world one last time before she dies. However, Luca learns that she needs to be put on end-of-life care, meaning she cannot use the ticket.[26] To give Winnie a good experience, Luca teams up with Valerie to give her a "trip of a lifetime" from her own bed, by using props to give her an immersive experience.[27] Days later, Luca hears that Winnie is "fading fast" and he realises that "the time has come for him to say goodbye".[28] Before her death, she offers Luca her around-the-world ticket, which her son, Stuart Jones (Will Barton) is infuriated at. He accuses Luca of being a gold digger and using his mother to get money, which Luca denies. He explains that due to his code of practice, he does not feel comfortable taking the ticket, as well as feeling that he cannot see the world without Billy. However, he eventually feels that he owes Winnie the chance for her ticket to be used and that it would be honouring both her and Billy. He informs Zara and Daniel of his decision, who decline his request since he wants to leave in two days time. However, Emma convinces Zara to allow him to go.[29] Luca's exit was written into the soap due to McLaren being offered a role in a touring production of Singin' in the Rain. His management confirmed that following the conclusion of the tour, McLaren would return to Doctors as Luca.[30] He made his onscreen return in January 2023, where he returns to the Mill to surprise the staff but finds Karen collapsed on the floor after a heart attack.[31]