Adventure Time is an animated TV series on Cartoon Network that has been airing since 2010.
The Adventure Time Fandom usually appears in the form of Finn the human, the main character of the show, but has been known on occasion to take the form of other characters, including Fiona and Marshall from the genderswapped version of the series.
Adventure Time is physically very strong and they have a certain set of morals they live by. They believe in justice and have a strong desire to make sense out of the unusual.
However, they can be somewhat emotional when it comes to relationships and find psychologically stressful situations to be particularly challenging.
Homestuck Fandom - Matesprit
It has been hinted that the Adventure Time Fandom may or may not be in a red relationship with the Homestuck Fandom, but this is something they are secretive about.