In the 75th Hunger Games, Mags volunteered for Annie Cresta, Finnick's true love. He also said that she was one of the only people who actually liked him as Katniss and Peeta were about to leave the bloodbath with them.
Shortly after, we see that the tribute accompanying him from District 4, his former mentor Mags (the late Lynn Cohen), volunteered to protect him and Annie Cresta (Stef Dawson) — the love of Finnick's life.
Chia Mags kisses Finnick on the mouth to briefly let him know that this is the last time she will see him. It's her way of saying "Goodbye" but in a more affectionate way.
Annie was a very kind-hearted and forgiving young woman, capturing the heart of fellow victor Finnick Odair, and later voting against President Coin's proposed 76th Hunger Games using Capitol children.
However, he tells Katniss that his admirers pay for his company with secrets, suggesting a depth to his character that perhaps not many people get to see. Finnick's flirting with Katniss is harmless enough; however, their interaction in this chapter foreshadows more to come.
The Life of Finnick Odair: Hunger Games Explained (From the Books)
Who was Katniss truly in love with?
Katniss made the choice to build her future with Peeta. If she didn't love him, she wouldn't have made that choice. Katniss made her whole world about getting the people she cared about to the next day, her choice to survive with Peeta proves her love for him.
Their relationship was all friends. They trusted each other, but that doesn't mean they had romantic feelings for each other. Plus, Cinna's too old for Katniss.
Why do you think Johanna dislikes Katniss so much?
In the case of Johanna, they each hated each other because that was what the Capitol had taught them to do. They were from competing Districts, and the idea of the Games was to keep the lesser citizens of Panem distrustful of one another and unwilling to form alliances (or raise arms in war).
During the 70th Hunger Games, Annie witnessed her fellow District 4 male tribute's beheading, which drove her to insanity. She has certain problems which included her closing her eyes and covering her ears, laughing when it was unnecessary, and staring into the distance at strange times.
The female Morphling, however, appears almost coincidentally, and Peeta even mentions that they don't know her real name. Given that she is willing to make the ultimate sacrifice to protect Peeta, it's safe to assume that the Morphling was committed to the rebel cause.
Realizing that they would be killed by the fog if they could not move faster, Mags kissed Finnick and courageously sacrificed herself by walking straight into the fog so Finnick, Katniss, and Peeta could live.
The group eventually outruns the fog except for Mags, who sacrifices herself so that Finnick can help Katniss save Peeta. They trip and tumble down a hill but eventually stop, and Katniss watches the fog approaching. It stops just before it can get to her because it is being contained by some type of force field.
As Katniss gets to know Finnick during the Quarter Quell, she sees he is in fact loyal, dutiful, and caring. For example, despite Mags being a burden on his chances of survival, Finnick does everything he can to keep the eighty-year-old alive because, as we learn, she was his mentor and he genuinely cares about her.
She's half-family, i.e., sorta or partially family, because there's affection but not blood relation. There are literally only 2 people in Finnick's family (Mags and Annie), and Mags is 1 of them.
In Mockingjay, it was revealed that President Snow sex trafficked Finnick to wealthy Capitol citizens and if Finnick refused, President Snow would kill somebody he loved. Finnick also cared a lot for his mentor, Mags, who had volunteered to participate in the Games, instead of Annie.
Peeta later explained to Katniss that Johanna did this to get a reaction, since she and the other tributes obviously saw Katniss as being the most "pure" of the Victors.
Johanna remains in the Capitol for quite a while, and she and Peeta are tortured for information concerning District 13 and the mockingjay rebellion. While in the Capitol, Johanna's entire head is shaved, making her bald.
Johanna Mason developed an addiction to morphling while hospitalized in District 13 for the torture she endured in the Capitol. When she was weaned off, she instead dipped into Katniss's supply.
At an unknown point in time years before the 74th Hunger Games, she was personally fired by Snow, the stated reason being due to her being too surgically enhanced.
Finnick Odair is the youngest winner in history, winning at just 14 years old. District 2 has the most overall winners, producing "Career Tributes" and having the highest number of victors among all districts. Warning: Spoilers ahead for The Ballad of Songbirds and Snakes!
After winning the games, Snow forced Finnick into prostitution and sold his body to Capitol residents to gain their trust. Finnick only agreed to take part because Snow threatened to torture his loved ones. Even though he bedded several women throughout his time as a victor, Finnick's love for Annie remained true.
He drank the poison in order to allay suspicions, then took the antidote, but resulted in bloody sores in his mouth. He also smells strongly of genetically enhanced roses, as he always wears a white rose in his lapel to cover the scent of blood. The strong smell invariably makes Katniss gag.
He is also a very caring person. Despite being Capitol raised, in the movie, he says he is sorry that Katniss became a tribute to her, unlike most, who just congratulate her. He attempts to calm Katniss down right before the 74th Hunger Games by holding her hand and saying if he was allowed to bet, he would bet on her.
