As Flynn, Hans and Kristoff are from different series, they have never met in canon. Even though Eugene's briefly seen cameo in Frozen indicates that their films might take place in the same canon. Along with a few Disney crossover games having the three cross paths or get added to the same team, by the player's choice.
They are viewed the main male characters of their films. The three also have their own steeds who have met and appear to be close with Rapunzel and Anna. Flynn, Hans and Kristoff had all stuck be Rapunzel and Anna's sides in order to gain what they promised them. At one time or another, the three men are seen wearing their own royal and winter style clothing. When Eugene, Hans and Kristoff went on journeys, they traveled in a group of people that they could trust. The three have even proposed to the Princess of their films.
Flansoff is seen as a poly-slash ship version of Rapunzelsanna, which is more popular, but the ship still has its own supporters. In the Disney crossover fandom of Frozen Tangled, the three men are the main male characters, while the other popular crossover fandom, Rise of the Brave Tangled Frozen Dragons, has them as secondary/honorary characters. Fans even have the three coming across each other when Kristanna, Helsa and Eugunzel are shipped beside each other as a group.
Because of the fan theory that Tangled and Frozen are in the same canon, fans will have the trio meeting each other in fanon. Since Eugene's Frozen cameo has him visiting Arendelle for coronation, fans have them meet through the event. In some fanfics and fanart where Hans isn't the villain or has reformed, the three men are featured as friends. Which is also common seen in a Modern AU. There have also been fanfics that have Flynn and Kristoff teaming up to fight Hans.
Even though Hans is a villain is he is still a prince, which is why a few fans include him in their Disney Prince group fanart, that commonly has Kristoff and Flynn added to them beside him. From the three being the first three CGI Disney Princes that fans have grown to love.
On fanfiction.net, the ship only has two fanfics in its crossover category.
- They are three of the characters in Disney Magic Kingdoms.
- All three of them appear in Kingdom Hearts III.
- Eugans refers to the ship between Flynn/Eugene and Hans
- Hansoff refers to the ship between Hans and Kristoff
- Kristene refers to the ship between Kristoff and Flynn/Eugene