Finlay "Fin" Roberts is a fictional character in the Australian soap opera Home and Away, portrayed by Tina Thomsen. She made her first appearance during the episode airing on 18 September 1991 and departed on 20 May 1994. Thomsen made return guest appearances in 1996 and 1997. Jessie Bullions portrayed a young Finlay in a flashback in 1997.

Thomsen was still a teenager when she secured the role and she relocated her family from Brisbane to Sydney to accommodate filming. Thomsen told Jenna Price from The Sydney Morning Herald: "It's me who did the pushing ... my parents just supported me."

In February 1994, Di Stanley of TV Week confirmed Thomsen would be departing the serial and filming her final scenes on 25 March. Thomsen had no regrets about her decision to leave, stating "I've wanted to leave for a while. Probably for the past nine months I've been getting itchy feet and wanting to leave. I've been here three years. It's a really long time and I didn't really feel my character was going anywhere anyway." Thomsen pointed out that Fin had not had a storyline in a long time, which is what sparked her decision to leave the show and pursue something else. She met with producer Russell Webb, who agreed that her character "had had her time." Thomsen was grateful for the exposure she had received from the show, for the friends she had made, and her partner at the time, Andrew Hill, who played Haydn Ross.

In 2012, Lynne McGranger who plays the character's on-screen mother Irene Roberts said that she doubted Finlay would ever return to the series because Thomsen had quit acting and became a mother.

Finlay is involved in a relationship with Blake Dean (Les Hill). The two characters share an "unexpected passionate kiss". Blake continues to battle his grief over losing his girlfriend Meg Bowman (Cathy Godbold), who died from leukaemia. Di Stanley from TV Week revealed that Finlay believes she has found the love she had long sought "after a turbulent and affection-starved childhood." Finlay cannot wait to tell others she and Blake are in a relationship. This forces Blake to admit he still loves Meg. A reporter from Inside Soap said that Finlay has "really fallen for" Blake and is "hurt and embarrassed" to be rebuffed by him. In the following months Blake changes his mind, but Finlay puts up a "fight" and tries to resist him. The writer added that Blake "broke her heart and made her feel a fool, and she isn't ever going to let him put her in that position again".

Finlay later turns down Blake's offer of a date, but agrees to go scuba diving with him as friends. However, Finlay fails to resurface after the dive because her oxygen supply is cut short and Blake fears that she has drowned. The scenes were filmed at UnderWater World in Mooloolaba, Queensland. The storyline served as the serial's end-of-year "cliff-hanger" and viewers had to wait until the series returned to find out whether or not Finlay survives. A writer from The Sun-Herald said that she would survive and be "possibly suffering from brain damage", while Inside Soap's reporter revealed that the character's "life hangs in the balance". This leads to "tense scenes" with Finlay's mother Irene and Blake. He then declares his love for Finlay, but other characters think that he is still not over his ex-girlfriend Meg.

In one storyline Finlay taking "uppers and downers" to help her studying for her high school certificate. Writers began Fin's descent into drugs via her struggles with exam revision. She decides to take pills to aid her revision. The pills keep her awake at night but leave her exhausted in the day. Fin's drug use soon leaves her irritable and agitated. When Pippa and Michael ask Fin to move bedrooms, she has an angry outburst. Michael is disgusted with her behaviour and Fin realises that she has a drug problem. Thomsen told a TVTimes reporter that "she took the pills with the best intentions." As Fin had to repeat a school year "she was determined to do well in her exams this year. But instead of making it easier to study, the pills just make her a bit manic. She starts yelling and throwing tantrums." Fin decides that she needs to overcome her new addiction. She tries to get hold of sleeping pills to counteract them but to no avail. Her behaviour then makes Irene suspicious of her. Thomsen concluded that Fin's experiences with drugs proved that they are "bad news".

Thomsen told Robert Kilroy-Silk on his show Kilroy Down Under that Finlay had a positive influence on young people at times. She explained to Kilroy-Silk that she "really enjoyed" the drug storyline and found it "worthwhile". She had "a lot of" younger girls and mothers writing to her to thank you to her for portraying the issue. When Thomsen was at high school, she knew other that were going through the same situation during studying as her character did. She added that it was a topic that "a lot of girls needed to know the effects of and after they watched it they sort of became aware of what was going to happen to them and that it was affecting them in the wrong way." She concluded that topics that achieve what Finlay's storyline did are "really worthwhile".